The sound of a mosquito can mean trouble in many parts of the world. The bite of the mosquito can be deadly. The insects carry serious diseases like malaria. It is estimated that almost 630,000 people died from malaria and malaria-related causes in 2012, and most of these cases were in African countries.
In the United States, a group of California scientists is working to develop a more effective and less costly substance(物质)to protect people from mosquitoes. The researchers are investigating the sense of smell in mosquitoes. They found the insects use the same receptor(感受器)for identifying carbon dioxide in human breath as they do for the smell of our skin. Anandasankar Ray, who is leading the investigation, says scientists tested more than a million chemical compounds(化合物)until they found a substance called Ethyl pyruvate. He says Ethyl pyruvate makes the mosquitoes' receptor inactive. ”When we apply Ethyl pyruvate to a human arm and offer it to hungry mosquitoes in a cage, very few of the mosquitoes are attracted to the human arm because only a few of them are able to smell it out,” said Ray.
Genevieve Tauxe, a member of the research team, says it was not easy to find the neurons (神经元)of nose cells that recognise both the smell of human breath and skin. "With the device used to examine mosquitoes, we are able to insert a very small electrode(电极)into the part of the mosquitoes' nose, where its smelling neurons are and where the smell is happening," said Tauxe.
Anandasankar Ray says a product based on Ethyl pyruvate may cost less to produce than DEFT，the most effective chemical treatment now in use. He says DEFT is too costly for most people who live in areas affected by malaria.
“Perhaps by finding smells that can attack other target receptors, we will be able to improve upon DEFT and finally have the next generation of insect behavior control products," said Ray.The best title for the passage is most probably _______________________________.
| A．Scientists Find New Substance to Fight Mosquitoes |
| B．A New Generation of DEET Has Been Developed to Kill Mosquitoes |
| C．Malaria一a Serious Disease Causing 630,000 Deaths |
| D．Ethyl Pyruvate一an Insect Behavior Control Product |
According to the passage, Ethyl Pyruvate can_______________________________.
| A．kill the mosquitoes' smelling neurons |
| B．cause the mosquitoes to lose their sense of smell |
| C．result in the inactiveness of the mosquitoes' receptor |
| D．make the mosquitoes uninterested in human breath and skin smell |
Through the passage, the writer aims to_______________________________.
| A．inform readers of the new development in fighting mosquitoes |
| B．praise the achievements made in the battle against malaria |
| C．introduce a cheaper product in fighting mosquitoes |
| D．tell the differences between Ethyl Pyruvate and DEET |
This passage most probably appears in_______________________________.
| A．the column of newspaper ads |
| B．the health column of a magazine |
| C．a textbook of medical schools |
| D．a collection of doctors' essays |
It’s a goal for millions and millions of families every year——keep the Christmas spending within a certain amount, but can still afford the gifts that your loved ones will enjoy. Never has this concern been greater in recent years than right now. Even so, there are several things that you can do to help.
Hit the sales.
No one wants to get up at four o’clock in the morning and fight to get the best deal on Black Friday, and it’s surely very tough to pick up the courage and get out there in the cold for a good deal, but sometimes——it can be well worth. Many retailers(零售商) offer specials all through the day——and some even offer online Black Friday specials, so you may still be able to get a great deal on Black Friday.
Pay close attention to advertisements.
Once the Christmas shopping season is coming, retailers hungry for business will do just about whatever to get you in the store. Pay very close attention to weekly advertisements of sales among the major retailers and you may be lucky enough to find different prices for the same thing in different shops.
Shop online.
Some of us don’t like running from store to store in order to get the best price on the perfect gift, and some of us don’t like to go out in the cold at all——thankfully for us, we can do online shopping.
The world of online shopping lets people visit all the major retailers as well as some specialty stores that could only be found on the Internet. Customers can find exactly what they are looking for, at the best possible price without ever having to leave the house. With traditional Christmas shopping consumers are sometimes limited to what’s left in stock if they wait too long to get to a particular store. The first paragraph implies that ______.
| A．nowadays not many people can afford expensive gifts |
| B．recently many people don’t want to spend money on gifts |
| C．Christmas is a time to make our loved ones enjoy their gifts |
| D．Christmas is a time to make us feel free to buy our loved ones gifts |
In the writer’s opinion, it is rewarding on Black Friday _____.
| A．if the weather is not very cold | B．if we don’t have to fight for the best deals |
| C．if we don’t have to get up early | D．If we get what we want at a good price |
The underlined word “specials” means_______.
| A．some experts in shopping |
| B．certain things for especially low price |
| C．some kind of help for a certain customer |
| D．things that can only be found on Friday |
We can have more choices _____.
| A．on Black Friday | B．in a particular store |
| C．on the Internet | D．from retailers |
Some time ago, I discovered that one of my chairs had a broken leg. I didn’t think there would be any difficulty in getting it mended, as there are a lot of antique (古董)shops near my home. So I left my home one morning carrying the chair with me. I went into the first shop expecting a friendly reception (接待). I was quite wrong. The man wouldn’t even look at my chair.
The second shop, though slightly more polite, was just the same, and the third and the fourth. So I decided that my approach must be wrong.
I entered the fifth shop with a plan in my mind. I placed the chair on the floor and said to the shopkeeper, "Would you like to buy a chair?" He looked at it over carefully and said, "Yes, not a bad chair. How much do you want for it?" "Twenty pounds." I said. "OK," he said, "I will give you twenty pounds." "It’s got a slightly broken leg," I said. "Yes, I saw that, it is nothing. "the shopkeeper answered.
Everything was going according to my plan and I was getting excited. "What will you do with it?" I asked. "It will be easy to sell once the repair is done." "I will buy it." I said. "What do you mean? You just sold it to me." "Yes, I know, but I have just changed my mind, I am sorry. I will give you twenty - seven pounds for it." "You must be crazy." he said. Suddenly the penny dropped. "I know what you want. You want me to repair your chair." " You are right," I said, "What would you have done if I had walked in and asked you to mend the chair?" "I would not have agreed to do that. We don’t do repairs, not enough money in it, and too much trouble. But! will mend this for you. Will you pay it for five? ". He was a very nice person and was greatly amused (感到有趣)by the whole thing. We can learn from the passage that in the first shop the writer________.
| A．was rather impolite |
| B．was warmly received |
| C．asked the shopkeeper to buy his chair |
| D．asked the shopkeeper to repair his chair. |
The expression" the penny dropped" in the last paragraph means the shopkeeper_________.
| A．changed his mind | B．accepted the offer |
| C．saw the writer’s purpose | D．decided to help the writer |
How much did the writer pay for the repair?
| A．5. | B．7. | C．20. | D．27. |
From the text, we can learn that the writer was___________.
| A．honest | B．careful | C．smart | D．funny |
It was getting dark and snow was coming down. Joe was driving home. He’d been unemployed since the factory closed. Most of his friends had left, but he stayed on. After all, he was born here.
Suddenly he saw a lady standing on the side of the road and pulled up. She was worried. No one had stopped to help her. Was he going to hurt her? He looked poor and hungry. Joe knew how she felt and said, “My name is Joe and I’m here to help you.” All she had was a flat tire, but for an old lady, that was bad enough. Joe changed the tire, but he got dirty and his hands were hurt. She wanted to pay Joe and said any amount would have been all right. Joe never thought twice about the money and there were plenty who had given him a hand in the past. He had lived his whole life that way. He told her that if she really wanted to pay him back, the next time she saw someone who needed help, she could give that person the assistance that they needed.
Later the lady went in a dingy-looking restaurant to grab a bite to eat. The cash register was like the telephone of an out-of-work actor----it didn’t ring much. The waitress, who was nearly eight months pregnant, brought a clean towel to her with a sweet smile. The old lady remembered Joe. After the waitress brought the change from a 100-dollar bill, she found the lady gone and something written on a piece of paper, “Someone once helped me out----the way I’m helping you. If you really want to pay me back, don’t let the chain of love end with you.”
That night the waitress gave her sleeping husband a soft kiss and whispered, “Everything’s going to be all right. I love you, Joe.”What do we know about Joe from this passage?
| A．On his way home after work, he helped an old lady. |
| B．He had worked in a factory in his hometown before. |
| C．He would move away to fulfill his dream soon. |
| D．Though he was poor, he didn’t care about money at all. |
The saying “she wanted to pay Joe and said any amount would have been all right” in Paragraph 2
suggests that _____.
| A．the old lady was very grateful to Joe’s timely aid |
| B．the old lady was much worried to be hurt by Joe |
| C．the old lady wanted to show off her fortune to Joe |
| D．the old lady’s car was very difficult to repair for Joe |
Which of the following is TRUE according to Paragraph 3?
| A．The restaurant was not only light but also clean. |
| B．The old lady did have a big meal in the small restaurant. |
| C．The waitress was more than eight months pregnant. |
| D．The old lady left the remaining money to the waitress. |
Which of the following would be the best title for the passage?
| A．Acts of luck | B．A warm-hearted man |
| C．The chain of love | D．A generous lady |
“Few things help an individual more than to place responsibility upon him，and let him know that you trust him.” These words are from the black American educator，Booker Washington. He was saying that，“If you want people to grow up，you have to stop treating them like children.”
In America，families are close but children are encouraged to be independent，to make their own decisions，even at a very early age. It’s not unusual for a child of seven to be given an allowance(津贴)every week. The child is encouraged to save some of the money but he or she can spend it on whatever they choose，for example，buying clothes，school supplies or CDs. Some teenagers even have their own credit cards! That’s a big responsibility since even adults are tempted to overspend when they have credit cards.
From an early age，American children are asked for their opinions and they are included in family decision making. At the dinner table，teenagers will be listened to on any topic，from politics to buying a new family car or where the family will go on vacation. In this way, teenagers are getting practice in becoming individuals：they are learning how to stand on their own two feet.
Many Chinese young people are becoming almost as interested as American teens in searching for independence. They want to express those qualities that make them unique human beings. You can see this in the way they dress, the music they listen to and the friends they choose. “Super Girl” Li Yuchun caught the imagination of Chinese teenagers on the “Super Girl” television contest. She was not the traditional “nice，young Chinese girl”. With her short，spiky hair and boy-like clothes, she was telling everyone that she was different. She had the courage to be her own person and to stand on her own two feet...and she won!
There is an old saying，“Everyone should carefully observe which way his heart draws him and then choose that way with all his strength.” If you do this, step by step, over a period of time, you may find that you have become the person you always wanted to be.The passage is intended to encourage the youth to________.
| A．save money for useful things | B．become independent |
| C．express their great ambitions | D．make important decisions |
A child of seven is given an allowance so that he can______.
| A．be accepted as a popular guy | B．learn to decide how to use money |
| C．overspend money without care | D．have school supplies of his own |
The author implies that many Chinese children________.
| A．are more independent than Americans | B．should become interested in America |
| C．are happy with their present situation | D．are not satisfied to be nice, quiet ones |
The main idea of the last paragraph is________.
| A．that we should do things step by step | B．why we should understand our desires |
| C．what we should plan for our own life | D．how we can manage to realize our dreams |
WASHINGTON, Sept. 6 (Xinhua) -- U.S. President Barack Obama on Monday announced a new
plan to renew and expand the nation's roads, railways and runways, in a bid (努力) to restart the sluggish economy and to help create jobs.
Obama announced the billion-dollar infrastructure(基础设施) spending program at an event in Milwaukee, Wisconsin, marking the Labor Day holiday in the United States.
The proposal calls for investments over six years, including rebuilding and modernizing 150,000 miles (241,350 kilometers) of roads, 4,000 miles (6,430 kilometers) of railways and 150 miles ( 241 kilometers) of runways.
"It sets up an Infrastructure Bank to leverage(杠杆；利用) federal dollars and focus on the smartest investment. All of this will not only create jobs now, but will make our economy run better over the long haul," Obama said.
"This is a plan that will be fully paid for and will not add to the deficit over time," said Obama.
The U.S. unemployment rate rose to 9.6 percent in August, reflecting business reluctance to hire among uncertain economic prospects, the U.S. Labor Department reported on Friday.
The president admitted that new jobs "have not been coming fast enough" in the United States.
"These years would be some of the most difficult in our history. The problems facing working families are nothing new, but they are more serious than ever. And that makes our cause more urgent than ever," he added.What does the underlined word “sluggish” probably mean?
| A．繁荣的 | B．崩溃的 | C．疲软的 | D．行动迅速的 |
What’s the main idea of this passage?
| A．The US president launched a new program aiming at improving the nation’s infrastructure. |
| B．The US unemployment rate rose according to the Labor Department. |
| C．These years will be the most difficult in the American history. |
| D．More roads, railways and runways will be rebuilt and modernized. |
Which of the following will be changed most in length?
| A．Roads. | B．Railways. | C．Runways. | D．Highways. |