形成物种的关键是独立进化。（ ）

【名词&注释】

为什么(why)、关键是

[判断题]形成物种的关键是独立进化。（ ）

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学习资料：

[单选题]Why could many looters run away?

A. The police could not see them in the dark.
B. Policemen did not have guns.
C. They could hide in the shop.
D. There were not enough policemen to catch them all.

[单选题]—I am not quite myself today.—______go and see a doctor?

A. Why don't
B. Why not
C. Why you
D. Better to

[单选题]下列哪种方式是生物为适应低温环境而采取的措施( )

A. 夏眠
B. 穴居
C. 迁移
D. 昼伏夜出

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