Trees become unhealthy if the gardener _____.
A、allows too many branches to grow in the middle
B、does not protect them from wind
C、forces them to grow too quickly
D、damages some of the small side branches
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正确答案
试题解析
第二段最后一句“The health of a tree may be encouraged by removing branches that are blocking up the centre”说明，剪去阻塞树木中央空间的枝条可使树木健康生长，相反，保留这些枝条则会导致树木长得不健康。
