We each have a unique genetic (基因的，遗传的) make-up. Every cell of your body has the same set of about 100,000 separate genes made of DNA. These are the instructions for producing a person. Genes decide everything from the colour of your skin to the way your brain works. You have one of several billion combinations of DNA which come from the random mixing of your parents’ genes. Except for identical twins (同卵双胞胎), no one has the same combination as another person. You are unique! You are unique in another way too: in the way you are raised and all the experiences you have from before birth to adult life. These experiences influence you, your behaviour and attitudes, and the choices you make.
But are genes or life experiences more important in shaping your appearance and personality? Scientists are studying twins to find out. One set of twins occurs every 70 births---some are identical and others are non-identical twins. Identical twins are special because they share exactly the same genes and often the same environment. Non-identical twins are more like ordinary brothers and sisters.
Some identical twins have been adopted and brought up in different homes. With identical genes but a different home environment, scientists can study twins to see how much a particular feature depends on the genes we inherit. For example, we know that eye problems, like short-sightedness, are mostly genetic. But resistance to pain is largely dependent on experiences. Genes also influence our eating habits. Identical twins brought up apart often like to eat at the same time of day and feel full after eating the same amount. Non-identical twins in similar circumstances have more varied eating habits. Identical twins are also more likely to follow the same patterns for marriage and divorce than non-identical twins.
Scientists are trying to identify the different genes that influence our behaviour. Some people are thrill-seekers and get into risk-taking and adventurous activities. They take up extreme sports like bungee jumping and possibly take drugs. Scientists have discovered a gene which affects this.
We could ask, “Are our lives determined by our genes or our upbringing?” Scientists are learning more all the time, but it is certainly true that both are important in making us who we are.
【小题1】What is the main idea of the first paragraph?

We each have a unique genetic (基因的，遗传的) make-up. Every cell of your body has the same set of about 100,000 separate genes made of DNA. These are the instructions for producing a person. Genes decide everything from the colour of your skin to the way your brain works. You have one of several billion combinations of DNA which come from the random mixing of your parents’ genes. Except for identical twins (同卵双胞胎), no one has the same combination as another person. You are unique! You are unique in another way too: in the way you are raised and all the experiences you have from before birth to adult life. These experiences influence you, your behaviour and attitudes, and the choices you make.

But are genes or life experiences more important in shaping your appearance and personality? Scientists are studying twins to find out. One set of twins occurs every 70 births---some are identical and others are non-identical twins. Identical twins are special because they share exactly the same genes and often the same environment. Non-identical twins are more like ordinary brothers and sisters.

Some identical twins have been adopted and brought up in different homes. With identical genes but a different home environment, scientists can study twins to see how much a particular feature depends on the genes we inherit. For example, we know that eye problems, like short-sightedness, are mostly genetic. But resistance to pain is largely dependent on experiences. Genes also influence our eating habits. Identical twins brought up apart often like to eat at the same time of day and feel full after eating the same amount. Non-identical twins in similar circumstances have more varied eating habits. Identical twins are also more likely to follow the same patterns for marriage and divorce than non-identical twins.

Scientists are trying to identify the different genes that influence our behaviour. Some people are thrill-seekers and get into risk-taking and adventurous activities. They take up extreme sports like bungee jumping and possibly take drugs. Scientists have discovered a gene which affects this.

We could ask, “Are our lives determined by our genes or our upbringing?” Scientists are learning more all the time, but it is certainly true that both are important in making us who we are.

1.What is the main idea of the first paragraph?

   A. We cannot easily change our physical appearance.

   B. How we turn out depends on our parents’ genes.

   C. Everyone has a physical double somewhere in the world.

   D. Both our genes and our experiences make us who we are.

2.Why are scientists studying twins?

   A. To find out how many twins are born every year.

   B. To discover what shapes us as individuals.

   C. To compare differences between twins.

   D. To study brother-and-sister relationships.

3.According to the passage, __________.

   A. one in 70 twins are genetically identical

   B. non-identical twins are usually not of the same sex

   C. twins separated at birth behave exactly the same

   D. identical twins are genetically the same

4.Which of the following is most affected by experience according the passage?

   A. Eating habits.   B. Eye-sight.   C. Pain resistance.   D. Marriage patterns.

5.What does the underlined “this” in Paragraph 4 refer to?

   A. Our love of sport.             B. Our attitude to risk-taking.

   C. Our skill at bungee jumping.    D. Our ability to take drugs.

If you don't get along well with your teachers, you can try to do this. Before you try to get out of a class to escape a teacher you don't like, here are a few things you can try to make a difficult relationship work:

◆Ask yourself, "What can I learn from this teacher?" Even if you don't worship his or her personality or lectures, dig deep until you find a subject in which he or she is very knowledgeable. Focus on that part of the teacher's personality, and use him or her as a tool for learning. Not only will you gain more knowledge in that subject, but a closer relationship with your teacher may help you understand one another better.

◆Talk to students who are doing well in the class and ask them for tips, tools, and a plan of action to get along with the teacher better. If you're too shy to talk to another student, study his or her actions and behavior in the classroom and try to follow that lead.

◆If you still can't get along, make an appointment with the school guidance counselor (辅导员). He or she will offer many tips and suggestions for you to get out of difficult teacher relationships. Sometimes a guidance counselor can act as a mediator (调解员) between you and the teacher. That means they can help you and your teachers get rid of the bad impression on each other.

◆If your relationship problems can't be solved in school, then it's time to tell your parents or guardians. Let them meet with your teacher and try to work it out.

Teachers are there for more than just homework, and they know about more than just their subject matter. They can help you learn how to function as an adult and a lifelong learner.

Undoubtedly, there will be a few teachers along the way who you will always remember and who might change your life forever.'"

68. Which of the following is the best title for the passage?

A. Advice for Students on Solving Problems in Everyday Life

B. Advice on Making a Good Excuse for Your Absence from Class

C. Advice on Developing Friendship with You Classmate

D. Advice on Getting Good Relationship with Your Teachers

69. According to the second paragraph, we can infer that _____.

A. there must be something good in every teacher for you to learn from

B. good relationship with your teachers must need your interest in the subject they teach

C. finding what the teachers are good at can't help you solve the problems

D. understanding each other is the only way to solve every problem

70. Which one is NOT the reason why we could ask help from guidance counselors?

A. Guidance counselors have the right to blame teachers.

B. Guidance counselors can give good advice to solve problems.

C. Guidance counselors can speak good things for you before your teachers.

D. Guidance counselors can help analyze the situation in the teacher's position.

71. What's the writer's attitude towards teachers?

A. He thinks that a teacher can only teach knowledge in his major.

B. He doesn't think teachers are very useful for a student's development.

C. He respects the teachers very much and thinks highly of their functions.

D. He thinks that every teacher has a great effect on his students.

It suddenly _____ to me that we could ask our neighbors to help us.

1. A.
   thought
2. B.
   happened
3. C.
   came
4. D.
   occurred