问题 单项选择题

关于下列氨基酸的说明,哪个是不正确的?()

A、酪氨酸和苯丙氨酸都含有苯环

B、苏氨酸和丝氨酸都含有羟基

C、亮氨酸和缬氨酸都是分枝氨基酸

D、脯氨酸和酪氨酸都是非极性氨基酸

E、组氨酸和色氨酸都是杂环氨基酸

答案

参考答案:D

阅读理解

We all have our own ways of sharing our life experiences with others.

Photographers use cameras,artists use brushes, musicians use songs and writers use stories.

Spencer Johnson's story Who Moved My Cheese? shows changes exist in(存在于)our life.  Life changes and so we do. We must change ourselves to face the changing environment, or we will fail.

Just look at the cycle(循环)of the seasons. Trees bud(发芽)in spring and in summer their leaves turn green. In autumn, their leaves start to fall onto the ground. When winter arrives, there are no leaves on trees. Next spring the cycle begins again. Since we know there are cycles in nature, we can prepare for them. We know it is colder in winter and hotter in summer, so we can dress properly.

Since we accept the cycles of nature,we should also accept the changes in our life.

We can prepare ourselves for changes by becoming more flexible(灵活的). We can regard the changes in our life as chances. As we keep changing ourselves, we can keep up with the changes in our life.

小题1:What do writers use to share their life experiences?

A.Stories.

B.Newspapers.

C.Basketballs.

D.Pianos.小题2:Who Moved My Cheese? tells us that ______.

A.changes exist in our life

B.we should move other’s things

C.we should use books to share our life experiences

D.there are difficulties in our life小题3:The cycle of the seasons means ______.

A.we should wear warm clothes in winter

B.we should accept the changes in our life

C.we should prepare for the weather

D.leaves turn yellow in autumn小题4:If you fail a test, what should you think according to the passage?

A.I have no chance to pass the test.

B.Exams are hard for me.

C.I have bad luck.

D.It's good for me because I know there are more to learn小题5:What's the main idea of this passage?

A.Weather changes in different seasons.

B. Who Moved My Cheese? is a good book.

C.We should change ourselves when life changes.

D.We should not lose heart when we meet with difficulties.

单项选择题