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.
正确答案：C
42．答案为C根据第二段Atreemaygrowhealthierbyremovingthebranchesthatarelockingupthecentre可知树中间的枝杈不利于树木生长C与文章内容相反因此错误
