问题 单项选择题

可诱导机体产生免疫耐受的抗原称为()。

A.半抗原

B.变应原

C.耐受原

D.超抗原

E.丝裂原

答案

参考答案:C

阅读理解

阅读理解

     One moming a few years ago, Harvard President Neil Rudenstine overslept. For this busy man. it was a sort of alarm: after years of non-stop hard work, he might wear himself out and die an early death.

     Only after a week's leave-during which he read novels,listened to music and walked with his wife on a beach-was Rudenstine able to return to work.

     In our modern life, we have lost the rhythm between action and rest. Amazingly, within this world there

is a universal but silly saying, "l am so busy. "

     We say this to one another as if our tireless efforts were a talent by nature and an ability to successfully deal with stress. The busier we are, the more important we seem to ourselves and , we imaglne , to others. To be unavailable to our friends and family, and to be unable to find time to relax-this has become the

model of a successful life.

     Because we do not rest,we lose our way. We miss the guide telling us where to go, the food providing us with strength , the quiet giving us wisdom.

      How have we allowed this to happen? I believe it is this: we have forgotten the Sabbath, the day of the week-for followers of some religions-for rest and praying. It is a day when we are not supposed to work, a time when we devote ourselves to enjoying and celebrating what is

beautiful. It is a good time to bless our children and loved ones, give thanks.share meals, walk and sleep. It is a time for us to take a rest, to put our work aside, trusting that there are larger forces at work taking

care of the world.

      Rest is a spiritual and biological need; however,in our strong ambition to be successful and care for our many responsibilities ,we may feel terrbly guilty when we take time to rest. The Sabbath gives us

permission to stop work. In fact, "Remember the Sabbath" is more than simply permission to rest; it is a

rule to obey and a principle to follow.

1. The "alarm" in the first paragraph refers to " ________ ".  

A. a signal of stress      

B. a warning of danger

C. a sign of age            

D. a spread of disease

2. According to Paragraph 4, a successful person is one who is believed to _________.   

A. be able to work without stress

B. be more talented than other people

C. be more important than anyone else

D. be busy workingwithout time to rest

3. Some people feel guilty when taking time to rest because they ________. 

A. think that taking a rest means lacking ambitions

B. fail to realize that rest is an essential part of life

C. fail to realize that religions force them to rest

D. think that taking a rest means being lazy

4. What is the main idea of this passage? ________   

A. We should balance work with rest.

B. The Sabbath gives us permission to rest.

C. It is silly for anyone to say "I am so busy."

D. We should be available to our family and friends.

填空题