Food sometimes gets poisoned with harmful things. A person who eats such food can get an illness called food poisoning. Food poisoning is usually not serious, but some types are deadly. The symptoms of food poisoning usually begin within hours of eating the poisoned food. Fever is one of the most common symptoms.
Certain microorganisms（微生物）cause most types of food poisoning. Bacteria and other microorganisms can poison eggs, meat, vegetables, and many other foods. After enteringthe body, these tiny living things release poisons that make people sick.
Some chemicals can also cause food poisoning. They are often added to food while it is being grown, processed, or prepared. For example, many farmers spray chemicals on crops to kill weeds and insects. Some people may have a bad reaction to those chemicals when they eat the crops.
Some plants and animals contain natural poisons that are harmful to people. These include certain kinds of seafood, grains, nuts, seeds, beans, and mushrooms.
When people handle food properly, the risk of food poisoning is very small. Microorganisms multiply rapidly in dirty places and in warm temperatures. This means that people should never touch food with dirty hands or put food on unwashed surfaces. Food should be kept in a refrigerator to stop microorganisms from growing. Meat needs to be cooked thoroughly to kill any dangerous microorganisms. People should also wash food covered with chemicals before eating it. Finally, people should not eat wild mushrooms or other foods that grow in the wild. Some of these foods may contain natural materials that are poisonous to humans. In addition, some types of fish can be poisonous.
Most people recover from food poisoning after a few days of resting and drinking extra water. If people eat natural poisons, they must go to the hospital right away to have their stomachs emptied.Which of the following statements is NOT true?
| A．Food when poisoned can make people sick. |
| B．Food poisoning means death. |
| C．Food poisoning comes in varieties. |
| D．Food poisoning can be serious. |
We know from the passage that the symptoms of food poisoning _________.
| A．are always accompanied by a fever |
| B．are too common to be noted |
| C．can be noticed within hours |
| D．can be ignored |
Food poisoning can be caused by all the following EXCEPT___________.
| A．some chemicals |
| B．low temperatures |
| C．some tiny living things |
| D．certain natural materials |
From Paragraph 5, we can learn that__________.
| A．mushrooms should not be eaten |
| B．vegetables are safer than meat and seafood |
| C．natural poisons are more dangerous than chemicals |
| D．different types of food should be handled differently |
It can be inferred from the passage that_________.
| A．natural materials are safe in food processing |
| B．chemicals are needed in food processing |
| C．food poisoning can be kept under control |
| D．food poisoning is out of control |
How do you design a pay plan that motivates people to do their best work? A new study by three Harvard researchers suggests a novel answer: Shortly after you hire new workers, give them a raise.
"Previous research has shown that paying people more than they expect may elicit reciprocity(相互作用) in the form of greater productivity," notes Deepak Malhotra, a Harvard business-administration professor who worked on the study. What he and his colleagues found, however, was that the connection between more pay and extra effort depends on presenting the increase "as a gift—that is, as something you've chosen to do purely as a nice gesture, with no strings attached."
Malhotra and his team studied 267 people hired by oDesk, a global online network of freelancers, to do a one-time data-entry project for four hours. All of the new hires were people in developing countries, for whom hourly wages of $3 and $4 were higher than what they had been making in previous jobs.
The researchers split the group up into three equal parts. One group was told they would earn $3 an hour. A second group was initially hired at $3 an hour but, before they started working, they got a surprise: The budget for the project had expanded unexpectedly, they were told, and they would now be paid $4 an hour. The third group was offered $4 an hour from the start and given no increase.
Even though the second and third groups were eventually paid the same amount, the second group worked harder and produced more—about 20% more—than either of the other two. People in the second group also showed the most stamina, maintaining their focus all the way through the assigned task and performing especially well toward the end of the four hours. Interestingly, the more experienced employees in the high-performing group were the most productive of all, apparently because their previous work experience led them to appreciate the rarity of an unexpected raise.
Contrary to conventional wisdom, Malhotra points out that higher pay, in and of itself, didn't promote productivity: People who made $4 an hour from the beginning worked no harder than those who were hired at $3 and were then paid $3.
To get the most impact from their pay plans, he adds, companies might consider not only what to pay new hires, but when to pay it.
"The key thing is how you present [the reason for an increase]," he says. Doling out extra money could promote productivity most "if you make it clear that the pay raise is something you're choosing to do just because you can. Our theory is that people will reciprocate. If you do something nice, they'll do something nice back."What does the underlined word “stamina” most probably mean?
| A．The quality of being intelligent or clever. |
| B．The quality of doing something difficult or dangerous. |
| C．The physical or mental energy needed to do a tiring activity for a long time. |
| D．A particular method of doing an activity, usually involving practical skills. |
Why did the second group produce more than the other two groups?
| A．Because they thought they were better paid than the other groups. |
| B．Because they were experienced employees from developing countries. |
| C．Because an unexpected raise reminded them of their previous work. |
| D．Because they felt they were nicely treated and tried best to repay it. |
What can we infer from this passage?
| A．No pains, no gains. |
| B．It matters not what we give but how. |
| C．Honesty is the best policy. |
| D．Actions speak louder than words. |
In the Caucasus region of Russia, nearly 50 out of every 100,000 people live to celebrate their 100th birthday, and many don’t stop at 100! By comparison, in America only 3 people in 100,000 reach 100. But these Russian old people aren’t alone. The Pakistanis, who live high in the Himalaya Mountains, and the Ecuadorans of the Andes Mountains seem to share the secret of long life, too.
These people remain healthy in body and spirit despite the passage of time. While many older persons in industrial societies become weak and ill in their 60s and 70s, some Caucasians aged 100 to 140, work in the fields beside their great-great-grandchildren. Even the idea of aging is foreign to them. When asked “at what age does youth end?”most of these old people had no answer. Several replied, “Well, perhaps at age 80.”
What accounts for this ability to survive to such old age, and to survive so well？First of all, hard physical work is a way of life for all of these long-lived people. They begin their long days of physical labor as children and never seem to stop. For example, Mr . Rustam Mamedov is 142 years of age. His wife is 116 years old. They have been married for 90 years. Mr. Mamedov has no intention of retiring from his life as a farmer. “Why？What else would I do？”he asks. All these people get healthful rewards from the environment in which they work. They all come from mountainous regions. They live and work at elevations of 1,660 to 1,000 meters above sea level. The air has less oxygen and is pollution-free. This reduced-oxygen environment makes the heart and blood vessel(血管) system stronger.
Another factor that may contribute to the good health of these people is theirisolation. To a great extent, they are separated from the pressures and worries of industrial society. Inherited factors also play some role. Most of the longest-lived people had parents and grandparents who also reached veryold ages. Good family genes may, therefore, be one factorin living longer.The example of Mr. and Mrs. Mamedov implies that some Caucasians aged 100to 140____.
| A．become weak and hopeless |
| B．are too old to work in the fields |
| C．benefit from physical work |
| D．are still working in the fields |
What is the main way of life for all of these long-lived people?
| A．Retiring from their lives as farmers. |
| B．Having been married for 90 years. |
| C．Hard physical work. |
| D．Having no intentions. |
Which of the following factors isn’t helpful to people’s health and long life?
| A．Clean mountain air. | B．Daily hard work. |
| C．Good genes | D．Stress and pressure. |
NOT all memories are sweet. Some people spend all their lives trying to forget bad experiences. Violence and traffic accidents can leave people with terrible physical and emotional scars. Often they relive these experiences in nightmares.
Now American researchers think they are close to developing a pill, which will help people forget bad memories. The pill is designed to be taken immediately after a frightening experience. They hope it might reduce ,or possibly erase(抹去),the effect of painful memories.
In November, experts tested a drug on people in the US and France. The drug stops the body releasing chemicals that fix memories in the brain. So far the research has suggested that only the emotional effects of memories may be reduced, not that the memories are erased.
The research has caused a great deal of argument. Some think it is a bad idea, While others support it.
Supporters say it could lead to pills that prevent or treat soldiers' troubling memories after war. They say that there are many people who suffer from terrible memories.
"Some memories can ruin people's lives . They come back to you when you don't want to have them in a daydream or nightmare. They usually come with very painful emotions," said Roger Pitman, a professor of psychiatry at Harvard Medical School. "This could relieve a lot of that suffering."
But those who are against the research say that changing memories is very dangerous because memories give us our identity (特质). They also help us all avoid the mistakes of the past.
"All of us can think of bad events in our lives that were horrible at the time but make us who we are. I'm not sure we want to wipe those memories out, "said Rebecca Dresser, a medical ethicist.The passage is mainly about.
| A．a new medical invention |
| B．a new research on the pill |
| C．a way of erasing painful memories |
| D．an argument about the research on the pill |
The drug tested on people can.
| A．cause the brain to fix memories |
| B．stop people remembering bad experiences |
| C．prevent body producing certain chemicals |
| D．Wipe out the emotional effects of memories |
We can infer from the passage that.
| A．people doubt the effects of the pills |
| B．the pill will stop people's bad experiences |
| C．taking the pill will do harm to people's health |
| D．the pill has probably been produced in America |
Which of the following does Rebecca Dresser agree with?
| A．Some memories can ruin people's lives. |
| B．People want to get rid of bad memories. |
| C．Experiencing bad events makes us different from others. |
| D．The pill will reduce people's sufferings from bad memories. |
I came to study in the United States a year ago. Yet, I did not know the real American society until I was injured in a car accident because after the car accident I had to see a doctor---- and go to court(法庭).
After the accident, my roommate called a doctor for me. I was very grateful and determined to repay him one day. But the next day, he asked me to pay him $200 for what he had done. I was astonished. He had good reason to charge me, he said. And if I wanted to collect money from the person who was responsible for my injury. I’d have to have a good lawyer. And only a good doctor can help me get a good lawyer. Now that he had helped me find a good doctor, it was only fair that I should pay him.
But every time I want to see doctor, I had to wait about 50 minutes. He would see two or three patients at the same time, and often stop treating one so as to see another. Yet he charged me $115 each time. The final examination report consisted of ten lines and it cost me $215.
My lawyer was all smiles the first time we met. But after that he avoided seeing me at all. He knew very well the other party was responsible for the accident, yet he hardly did anything. He simply waited to collect his money. He was so irresponsible that I decided to dismiss him. And he made pay him $770.
Now I had to act as my own lawyer. Due to my inexperience, I told the insurance(保险) company the date I was leaving American. Knowing that, they played for time,….. and I left without getting a cent.
My experience taught me two things about America: firstly, in a country like America money is everything. It is more important than friendship, honor or professional morality（职业道德）. Secondly foreigners are still being treated unfairly. So when we talk about America, we should see both its good and bad sides.The author’s roommate offered to help him because ------------.
| A．he felt sorry for the author |
| B．he thought it was a chance to make some money |
| C．he knew the doctor was a very good one |
| D．he wanted the author to have a good lawyer |
The word “charge” in this passage means ----------.
| A．be responsible | B． accuse | C．ask as a price | D．claim |
Both the doctor and the lawyer in the passage are very ----------.
| A．friendly | B．greedy | C．professional | D．busy |
What conclusion can you draw from the story?
| A．Going to court is something very common in America |
| B．One must very careful while driving a car |
| C．There are more bad sides in America than good sides |
| D．Money is more important than other things in America |
Do you like to eat out? Do you like to eat quickly? Do you like inexpensive food? Some people go to fast-food restaurants for these reasons. In the past, people usually went to diners（小餐馆）for these reasons. In fact, many people in the States still go to diners today for the same reasons.
A man named Walter Scott had the first “diner” in 1872. It wasn’t a real diner. It was only a food cart. People on the street walked up to the cart to buy food. These carts served late-night workers who wanted a cup of coffee and a late-night meal. The meal was a sandwich or boiled eggs. In 1887, Samuel Jones built the first diner big enough to allow the customers to come inside. However, they did not sit down. Later, people built diners with counters and stools, and people sat down while they ate.
Before long, many diners stayed open around the clock. In other words, people were able to eat in diner at any time. Diners changed in other ways, too. The original menu of sandwiches and coffee became bigger. It included soup, favorite dishes, and a breakfast menu. In addition, diners soon became permanent buildings. They were no longer carts on wheels.
Diners today look similar to the diners of the early 1900s. They are usually buildings with large windows. Inside, the diners have shining counters with stools, booths, and tables and chairs. People can eat all three meals in a modern diner.
Today, many people eat in fast-food restaurants such as McDonald’s and Burger King. However, the diner remains an American tradition, and thousands of people still enjoy eating there. It was popular a century ago, and it is still popular today.A man named Walter Scott had the first “diner” in 1872. Why is the word “diner” in quotation marks(引号)？
| A．Because it is spelled differently from “ dinner” |
| B．Because the first diner was not what it is now |
| C．Because diner was a new word |
| D．Because it is a special kind of restaurant |
According to paragraph 3, diners changed in __________
| A．Two ways | B．three ways | C．four ways | D．five ways |
Which of the following is NOT true according to the passage?
| A．Diners existed before a fast-food restaurant |
| B．The menu included more food than sandwiches and coffee |
| C．Burger King is a fast-food restaurant |
| D．Sandwiches became bigger |
The main idea of the passage is that ______________.
| A． The diner is a traditional , popular place to eat in the United States |
| B． Samuel Johns built the first diner big enough to allow the customers to come inside |
| C． American diners serve many types of food 24 hours a day to their customers |
| D． Diners are different from fast-food restaurants in many ways |