问题 单项选择题 A1/A2型题

蛋白质二级结构中最关键的化学键是()

A.氢键

B.肽键

C.离子键

D.范德华力

E.疏水作用

答案

参考答案:A

解析:肽链主链骨架原子的相对空间位置,并不涉及氨基酸残基侧链的构象称为蛋白质二级结构。蛋白质二级结构关键化学键是氢键。

完形填空

In November 1979,pupils in England were able to watch a new TV program called Monkey. Most of them were    this story for the first time. However, this story is not      to Chinese children. The Monkey King or Sun Wukong is the main character in the traditional Chinese book Journey to the West.

The Monkey King is not just any normal monkey. In fact, he sometimes does not even look like a       ! This is because he can make seventy-two      to his shape and size, turning himself into different animals and objects.  But       he can hide his tail, he cannot turn himself into a person. To fight bad people, the Monkey King uses a magic stick. Sometimes he can make     so small that he can keep it in his ear. At other times, he is able to make it big and long.

The Monkey King has     the children of China for many years. And as soon as the TV program came out more than thirty years ago, Western children became        in reading this story because the clever Monkey King keeps fighting to help the weak and never gives up.

小题1:A. writing        B hearing               C. telling

小题2:A. famous        B popular               C. new

小题3:A. monkey       B man                  C. horse

小题4:A. friends        B monkeys             C. changes

小题5:A. unless         B because               C. however

小题6:A. himself        B the stick              C. the teacher

小题7:A. trained        B excited               C. taught

小题8:A. worried       B relaxed               C. interested

单项选择题