单项选择题

A．Many species have moved further north.
B．Many new species have come into existence.
C．Many species have developed a habit of migration.
D．Many species have become less sensitive to climate.
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单项选择题
A．They were silent.B．They didn’’t tell a complete story.C．They were too expensive.D．They were too short.
A．They were silent.
B．They didn’’t tell a complete story.
C．They were too expensive.
D．They were too short.
单项选择题
The reason why studying the nature of human beings is popular is that.
A．the scale and scope of it is unprecedented
B．it is useful for determining policy
C．it is still an area of great mystery
D．there are so many best selling books about it
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