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【单选题】
下列有关生物群落演替的叙述错误的是A.
．群落演替主要有初 生演替 和次生演替两种类型，火灾后的草原，过量砍伐的森林、冰川泥地上进行的演替都属于次生演替
B.
．演替过程中由草本植物阶段渐变为灌木阶段，主要原因是灌木较为高大，能获得更多阳光
C.
．在生物群落发展变化过程中，一个群落被另一个群落代替的过程，就是群落的演替
D.
．群落演替的根本原因是群落内部因素的变化。
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【单选题】Everyone in our class was working hard and doing what we could _______ a good college.
A.
enter。m
B.
to enter
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D.
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【判断题】We could enter the manufacturing area of a pharmaceutical company freely.
A.
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B.
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A.
enter
B.
to enter
C.
entering
D.
entered
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