Which of the following usually causes a tree to grow unhealthy（）
A. Giving a tree a special shape and a definite height.
B. Removing small side branches and making a tree look less thick.
C. Allowing too many branches to grow in the middle.
D. Having a tree surrounded by many other trees.
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W: I don’t know why we listen to GeorgeM:（）
A. I don’ t know exactly why, either.
B. I guess we are wrong this time.
C. I know. But perhaps you don’ t know why.
D. George, you know, is one of the hardest working students among us.
57（）
A. say
B. describe
C. mention
D. write
Student A: May I use your computer this afternoonStudent B: I’ m sorry, but I have to finish typing this term paper today.Student A:（）
A. Do as you please.
B. It doesn’ t matter.
C. Thank you all the same.
D. Never min
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