Each cell in the human body contains about 25,000 to 35,000 genes, which carry information that determines your traits. Traits are characteristics you inherit from your parents; this means your parents pass some of their characteristics on to you through genes. For example, if both of your parents have green eyes, you might inherit the trait of green eyes from them. Or if your mom has freckles, you might inherit that trait and wind up with a freckled face. And genes aren’t just in humans — all animals and plants have genes, too.
Genes hang out all lined up on thread-like things called chromosomes. Chromosomes come in pairs, and there are hundreds, sometimes thousands of genes in one chromosome. The chromosomes and genes are made of DNA, which is short for deoxyribonucleic acid.
Chromosomes are found inside cells, the very small units that make up all living things. A cell is so tiny that you can only see it through the lens of a strong microscope, and there are billions of cells in your body. Most cells have one nucleus. The nucleus, which is sort of egg-shaped, is like the brain of the cell. It tells every part of the cell what to do. How does the nucleus know so much? It contains our chromosomes and genes. Tiny as it is, the nucleus has more information in it than the biggest dictionary you’ve ever seen.
71. What is the best title of this passage?
A. What Is a Gene? B. How Do Genes Work?
C. What Does A Gene Consist of? D. How Do Nucleus Command Cells?
72. What does the underlined word “inherit” probably mean in the first paragraph?
A. carry B. send C. obtain D. pass
73. Which of the following is NOT true according to the passage?
A. The parents pass some characteristics on to their children.
B. All living things receive traits from the old generations.
C. One’s green eyes might be passed on from the parents.
D.A mother’s freckled face might affect her young’s face.
74. From the passage we can know that______________.
A. genes can decide all your characteristics from parents.
B. genes exist inside cells that make up all living things.
C. genes tells every part of the cell what to do .
D. Chromosomes come in pairs containing genes.
75. From the passage we can conclude that ___________.
A. not all cells have one nucleus inside .
B. not all living things are made up of cells.
C. genes aren’t in humans but in animals and plants.
D. DNA is made of chromosomes and genes.
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 entering the 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.We know from the passage that the symptoms of food poisoning.
| A．are only accompanied by a fever |
| B．are too common to be noticed |
| C．can be ignored |
| D．can be noticed within hours |
Food poisoning can be caused by all the following EXCEPT.
| A．low temperatures |
| B．some chemicals |
| C．some tiny living things |
| D．certain natural materials |
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 |
Cara Lang is 13. She lives in Boston, Massachusetts, U. S. Last Thursday, she didn't go to school. She went to work with her father instead. Every year, on the fourth Thursday in April, millions of young girls go work. This is Take Our Daughters to Work Day. The girls are between the ages of 9 and 15. They spend the day at work with an adult, usually a mother, father, aunt, or uncle. They go to offices, police stations, laboratories, and other places where their parents or other family members work. Next year, the day will include sons, too.
The Ms. Foundation, an organization for women, started the program about ten years ago. In the U.S., many women work outside the home. The Ms. Foundation wanted girls to find out about many different kinds of jobs. Then, when the girls grow up, they can choose a job they like.
Cara's father is a film director. Cara says,“It was very exciting for me to go to the studio with my dad. I saw a lot of people doing different jobs.”Many businesses have special activities for girls on this day. Last year, Cara went to work with her aunt at the University of Massachusetts. In the engineering department, the girls learned to build a bridge with toothpicks and candy. In the chemistry department, they learned to use scales. They learned about many other kinds of jobs, too.
Right now, Cara does not know what job she will have when she grows up. But because of Take Our Daughters to Work Day, she knows she has many choices.What is Cara's father?
| A．An engineer. | B．An official. |
| C．A moviemaker. | D．A professor. |
According to the passage, Take Our Daughters to Work Day is ______.
| A．on every Thursday in April |
| B．a day for girls to know about jobs |
| C．a holiday for girls of all ages |
| D．a day for girls to get a job easily |
On this special day, Cara has done all the following EXCEPT that ____.
| A．she worked as an actress |
| B．she learned to use scales |
| C．she went to work with her aunt |
| D．she used toothpicks and candy to build a bridge |
What is probably the best title for the passage?
| A．Cara Lang, a Fortunate Girl |
| B．Take Our Daughters to Work Day |
| C．Children's Day and Work Day |
| D．Ms. Foundation, an Organization for Women |
Here is some must-know information from a handbook on how people behave in doing business in some countries.
In Brazil
Brazilians are warm and friendly. They often stand close when talking and it is common for them to touch the person on the shoulder. People often greet each other (particularly women) with light cheek kisses. Schedules tend to be flexible, with business meetings sometimes starting later than planned. But to be safe, be on time. Meals can stretch for hours—there’s no such thing as rushing a meal in Brazil. Lunches also can start in the mid to late afternoon. Brazilians are social, preferring face-to-face communication over mails or phone calls.
In Singapore
Singaporeans shake hands when they meet and often also greet each other with a small, polite bow. Business cards should be offered and received with two hands. Arriving late is considered disrespectful. So be on time. Efficiency(效率) is the goal, so meetings and dealings often are fast-paced. Singaporeans are direct in their discussions, even when the subject is about money. Rank is important and authority is respected. This determines both people interact in meetings. For example, people avoid disagreeing outright with someone with a higher rank.
In the United Arab Emirates
In the UAE, status is important, so the most senior or oldest should be greeted first with their titles. The handshake seems to be longer than elsewhere. So, do not pull away the handshake. Women should cover themselves when it comes to dress. Men also tend to be covered from neck to elbows(肘部) and down to the knees. People do not avoid entertaining in their homes, but they also hold business meals at restaurants. Touching or passing food or eating with your left hand is to be avoided. When meetings are one-to-one, if your host offers you coffee, you should refuse. It might seem odd, but it is a cultural tradition. Coffee should only be accepted if it is always set out or presented.
In Switzerland
The Swiss tend to be formal and address each other by last name. They also are respectful of private lives. You should be careful not to ask about personal topics. Punctuality (守时) is vital, something that comes from a deep respect for others’ time. Arrive at any meeting or even a few minutes early to be safe. They also have clear structure in their companies. Higher-ups make the final decisions, even if others might disagree. Neat, clean dress is expected. The Swiss follow formal table manners. They also keep their hands visible at the table and their elbows off the table. It is polite to finish the food on your plate.The passage is mainly about ________.
| A．customs and social manners |
| B．living conditions and standards |
| C．communication types |
| D．the workplace atmosphere |
Why do Singaporeans avoid arguing with their boss?
| A．They want to finish meetings as quickly as possible. |
| B．They are supposed to obey the person of a higher rank. |
| C．They put efficiency in the first place. |
| D．They dislike face-to-face communication. |
In the UAE, when should you refuse the coffee if it is offered?
| A．When attending a presentation. |
| B．When dining with business partners. |
| C．When greeting seniors. |
| D．When meeting the host alone. |
In which country do people care about where to put their hands at the dinner table?
| A．In the United Arab Emirate. |
| B．In Switzerland. |
| C．In Brazil. |
| D．In Singapore. |
I like watching butterflies. Sometimes I think I’m the only girl who notices these quiet but beautiful things. But if it hadn’t been for a crowded restaurant, I wouldn’t have ever noticed Valeri.
Valeri was a new student. She walked to class with her books against her chest and her head down. She talked only when the teacher asked her a question. After a month at our school, she hadn’t made any friend.
One day at lunch, most tables being full, I had nowhere to sit. Valeri sat alone, book in hand. I walked over to her, “Is that a good book?” Valeri gave a small nod and went back to reading. “What’s it about?” I asked. After seconds of silence, she looked at me, her eyes shining, “Well, it’s about a dragon! This boy, Eragon, finds this dragon egg when he goes playing one day. He thinks it’s a rock! The egg hatches（孵化）and Eragon hides the dragon from his cousin and uncle until it gets too big .”
Two weeks later, I was sitting in the auditorium（礼堂）enjoying the talent show. Then a shy girl walked on stage. I recognized her immediately. Valeri held a violin in one hand and a bow in the other. She started to play. The notes formed a soft, sweet tune(曲调). The auditorium fell completely silent until we realized the music was finished. I smiled to myself. Valeri wasn’t just “a quiet girl”. She knew about wonderful books and could play the violin like nothing I’d ever heard. Like a butterfly, she was beautiful and amazing when you looked closely.The author went to sit beside Valeri because _______.
| A．Valeri invited her to sit ther |
| B．Valeri’s book drew her attention |
| C．no more empty seats were left |
| D．she wanted to make friends with Valeri |
In the book Valeri was reading, _______raised the dragon.
| A．Eragon’ father | B．Eragon |
| C．Eragon’s cousin | D．Eragon’s uncle |
Butterflies are mentioned in the text to show _______.
| A．the beauty of butterflies | B．the author’s interest |
| C．the character of Valeri | D．the qualities of friends |
Which of the following words can best describe Valeri?
| A．Quiet and talented. | B．Friendly and active. |
| C．Careful and talkative. | D．Kind and enthusiastic. |
Not many things in life can be more irritating (令人气愤的): you are having a conversation with friends, but they check their phones and begin replying to texts or checking their emails. The Guardian (卫报) described the scene of a friend’s face buried in a screen as “a distinct 21st-century problem”. A new word has been created to describe this --- phubbing. It is the act of looking at your mobile phone instead of paying attention to others during a social interaction. Like pointing at one’s nose, phubbing is widely considered rude behavior. People everywhere are beginning to lose patience with the phenomenon.
A “Stop Phubbing” campaign group has been started in Australia and at least five others have appeared as anger about the lack of manners grows. The campaign’s creator, Alex Haigh, 23, from Melbourne, said, “A group of friends and I were chatting when someone said how annoying being ignored by people on mobiles was.” He has created a website where companies can download posters to discourage phubbing.
Phubbing is just one symptom of our increasing dependence on mobile phones and the Internet, which is replacing normal social interaction. A survey found that one out of three Britons would answer the phone in a restaurant and 19% said they would while being served in a shop. The survey came after a supermarket assistant in south London refused to serve a woman until she stopped using her phone. A survey, for a Sunday paper, also found that 54 per cent of people checked Facebook, Twitter or other social media every day, with 16 per cent checking more than ten times a day. An unsurprising 63 per cent of people carry their phone with them “almost all, or all of the time”, it found.
Phil Reed, a professor of psychology at Swansea University who has studied the Internet addiction disorder, said many phubbers show symptoms of addiction to their mobile phones.
Time magazine once pointed out, “Phubbing has a much greater potential harm to real-life connections by making people around us feel like we care more about posts than their presence.”
In the UK, Glamour magazine even imagined how novelist Jane Austen (1775-1817) would have written about people with bad mobile phone manners: “It is a truth universally acknowledged that a single man or woman in possession of a good mobile phone must be in want of manners.”Phubbing has occurred because _______.
| A．distrust has already been everywhere among people |
| B．the friendship between people is becoming weak |
| C．people are getting dependent on attraction online |
| D．there has been a lack of means of communication |
Which of the statements is TRUE about the “Stop Phubbing” campaign?
| A．It was first started in America and then it spread to Melbourne. |
| B．Companies can update posters against phubbing on the website. |
| C．Alex Haigh, 23, was the first one to find phubbing annoying. |
| D．Up till now, at least six groups have claimed to support it. |
The supermarket assistant refused to serve the woman mainly because _______.
| A．the woman buried her face in the mobile phone screen for a very long time |
| B．the woman ignored respect and manners by focusing only on her phone |
| C．the assistant lost his patience with the woman who was using her phone |
| D．it is rare for customers to answer the phone while being served in shops |
In the last paragraph, the writer wants to tell readers that ______.
| A．one with a mobile phone should mind his/her manners |
| B．Jane Austen must have worked for Glamour magazine |
| C．phubbing is going to be forbidden immediately in the UK |
| D．people with good manners must have good mobile phones |