A、Walking for twenty minutes a day three times a week strengthens the heart.

B、Swimming utilizes all the muscles of the body and improves lung capacity.

C、Exercise is important.

D、Exercise can contribute to a healthier heart and stronger lungs.

2.Which of the following sentences makes the best main idea?答案：D

A、As a college student there are many appealing courses of study from which to choose.

B、Computer science programs are increasingly popular.

C、Child care and teaching appeal to a large number of students.

D、Many high school students attend college.

3.Which of the following sentences makes the best main idea? 答案：D

A、Some of us suffer great stress over our relationships.

B、Much of our adult lives is spent trying to come to terms with one of our parents.

C、Many people seek therapy to cope with parental relationships.

D、For many of us, our relationship with our parents is unquestionably our greatest cause of stress.

4.People are increasingly concerned about food safety, and matters such as food-borne illnesses, environmental contaminations, natural toxicants in foods, pesticides, and food additives. Moving the food from the field to processors, stores, and onto your table requires a vast network. Public agencies monitor this huge network. Which of the following is the best topic for the passage? 答案：food safety

A、food safety

B、public agencies

C、food-borne illnesses

D、pesticides

5.Health is a cultural concept that is defined differently in different cultures. The prevailing definition of health has evolved from the “absence of illness” to the broader term, wellness, with its definition as “a life-style that emphasizes such health- promoting behaviors as eating a healthful diet, avoiding harmful substances, enjoying regular exercise, and cultivating self-esteem.” Which of the following is best topic for this passage? 答案：definition of healthA、cultural concepts

B、definition of health

C、cultivating self-esteem

D、eating a healthful diet

6.Sociolinguistics is concerned with the ethnography of speaking, that is, with cultural and subcultural patterns of speech variation in different social contexts. The sociolinguist might ask, for example, what kinds of things one talks about in casual conversations with a stranger. A foreigner may know English vocabulary and grammar well but may not know that one typically chats with a stranger about the weather or where one comes from, and not about what one ate that day or how much money one earns. A foreigner may be familiar with much of the culture of a North American city, but if that person divulges the real state of his or her health and feelings to the first person who says, “How are you?” he or she has much to learn about “small talk” in North American English. Similarly, North Americans tend to get confused in societies where greetings are quite different from ours. People in some other societies may ask a greeting, “Where are you going?” or “What are you cooking?” Some Americans may think such questions are rude; others may try to answer in excruciating detail, not realizing that only vague answers are expected, just as we don’t really expect a detailed answer when we ask people “How are you?” –Judith Resnick & Lanny Lester, Text & Thought, pp. 194-195 Which of the following is the best summary for this passage? 答案：D