问题 单项选择题

甘油三酯的合成有两条途径,其一是以甘油-酯与活化脂肪酸经两次脂酰基转移作用合成,其二是由α磷酸甘油与活化脂肪酸先生成磷脂酸后再经脱磷酸及转脂酰基作用后生成的。第一条途径进行的主要场所是()

A.肝细胞

B.心肌细胞

C.肠黏膜细胞

D.肾皮质细胞

E.脑细胞

答案

参考答案:C

阅读理解

One day in 1965,when I worked at View Ridge School in Seattle,a fourth­grade teacher approached me.She had a student who finished his work before all the others and needed a challenge.“Could he help in the library?” she asked.I said, “Send him along.”

Soon a slight,sandy­haired boy in jeans and a T­shirt appeared.“Do you have a job for me?” he asked.

I told him about the Dewey Decimal System(杜威十进分类法) for shelving books.He picked up the idea immediately.Then I showed him a stack(摞) of cards for long­overdue books that I was beginning to think had actually been returned but were misshelved with the wrong cards in them.He said,“Is it kind of a detective job?” I answered yes,and he became working.

He had found three books with wrong cards by the time his teacher opened the door and announced,“Time for break!”He argued for finishing the finding job;she made the case for fresh air.She won.

The next morning,he arrived early.“I want to finish these books,”he said.At the end of the day,when he asked to be a librarian on a regular basis,it was easy to say yes.He worked untiringly.

After a few weeks I found a note on my desk,inviting me to dinner at the boy’s home.At the end of a pleasant evening,his mother announced that the family would be moving to a neighbouring school district.Her son’s first concern,she said,was leaving the View Ridge library.“Who will find the lost books?” he asked.

When the time came,I said an unwilling good­bye.I missed him,but not for long.A few days later he came back and joyfully announced,“The librarian over there doesn’t let boys work in the library.My mother got me transferred back to View Ridge.My dad will drop me off on his way to work.And if he can’t,I’ll walk!”

I should have had an idea such focused determination would take that young man wherever he wanted to go.What I could not have guessed,however,was that he would become a genius of the Information Age:Bill Gates,tycoon(企业巨头) of Microsoft and America’s richest man.

小题1:What was the author when the story happened?

A.A teacher.

B.A librarian.

C.A detective.

D.A student.小题2:Why was the boy sent to the library by the fourth­grade teacher?

A.He failed to finish his work on time.

B.He challenged the teacher in the class.

C.He disturbed all the other students in the class.

D.He needed something to do to challenge himself.小题3:What was the boy told to do on his first day in the library?

A.To rearrange the books according to the new system.

B.To put those overdue books back to the shelves.

C.To find out the books with wrong cards in them.

D.To put the cards back in the long­overdue books.小题4:The boy got transferred back to View Ridge because ________.

A.he didn’t get along well with the librarian in the new school

B.he was not allowed to work in the new school’s library

C.he missed his old schoolmates and teachers

D.he had to walk a long way to go to school

判断题