Don’t talk about such things________ you do not understand.

me ______ buying it

A) away B) down C) out D) into

Remember that customers don’t ________ about prices in that city.

A) debate B) consult C) dispute D) bargain

bout time __________？

A) we are going home B) we go home

C) we went home D) we can go home

s about time __________？

A) we are going home B) we go home C) we went home D) we can go home

Frankly speaking, I’d rather you __________ anything about it for the time being.

A) didn’t do B) haven’t done C) don’t do D) have done

A.who

B.as

C.about which

D.with whom

ver？ If you have, don’t feel alone! It’s a very common, natural wish that has a long history.Spanish explorers of the sixteenth century even tried to find a fountain of youth in what is now the state of Florida.The water the this legendary fountain, which no one has yet found, was believed to restore youth and good health to those who drank it.

Biologists today don’t expect that anyone will find a magical fountain of youth.Growing older is a natural part of the life cycle that can’t be reversed.As human beings grow older, organs such as the heart and lungs may stop functioning properly.Sight and hearing may become weak.And the human body becomes more likely to come down with serious illnesses from which it cannot recover.

Considered together, changes that bring about the decline of an organism are called aging.Because of aging, many biologists believe that there may be a maximum age limit to which even the healthiest organisms can live.For human beings, this maximum age limit is about 110 years.

Perhaps the most important thing that you can learn from your study of human biology is that you have a lot of control over the aging process in your own life.In fact, within our control are many physical and mental factors that have much to do with aging.For example, each of us, as recent research indicates, can do many things to help prevent heart and vessel disease, which causes half the death each year in the United States.We can avoid eating a lot of fatty meat.Eating too much of these types of animal fats can lead to the clogging and hardening of blood vessels.We can cut back on smoking and hopefully quit entirely.We can limit the amount of alcohol we drink and the amount of sugar we eat.We can exercise regularly and strengthen the heart and other organs.And we can remember to take time out each day for ourselves, time just relax.Exercise, recreation and relaxation all reduce stress – inner tension that is hard on all body organs.

One final thing we can do is to try to keep aware of advances made in health education.Information is often available free of charge from health clinics or schools.

1.Which of the following is the leading cause of death in the United States？

A.Heart disease.

B.Cancer

C.Alcohol

D.Smoking

2.What happens as people grow older？

A.They dream of a magic pill to help them live a happy and long life

B.They come down with serious illnesses

C.Their organs become weak and may stop working properly

D.Their blood vessels become clogged

3.In the opinion of biologists, _________.

A.the aging process can be reversed

B.the aging process can be controlled and slowed down

C.the aging process can be got rid of

D.the aging process can go beyond its limit

4.We can slow down the weakening of all our body organs by ______.

A.not eating animal fat

B.limiting drinking and smoking

C.exercise, recreation and relaxation to reduce stress

D.preventing the clogging and hardening of blood vessels

5.Besides physical and mental factors, which of the following also contributes to living a long and healthy life according tot the passage？

A.Health education

B.Traditional medicine

C.artificial organs

D.The invention of magic pills

【题目描述】

44. Helen loves to talk about travel. She _____ many places. A. has gone to B. has been to C. has gone for D. has been from

【我提交的答案】： A

【参考答案与解析】： 正确答案：B

答案分析：

【我的疑问】（如下，请求专家帮助解答）

has gone to 与has been to的区别

They are teachers and don't realize _____ to start and run a company.

(A) what it takes (B) what takes it

(C) what they take (D) what takes them

A.I don’t know

B.It’s been delayed one hour

C.You have to be patient

D.Don’t ask me