填空题

______________________________ (这是一个生死攸关的问题) and therefore we must pay more attention to it.

【参考答案】

This is a matter of life and death
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填空题
The conditions in New Orleans after Hurricane Katrina is special.
单项选择题
Apes build nests in the trees but seldom sleep there for more than a night or two because ______.
A．they like to live in small family groups
B．they like to move from place to place in search of more food
C．they like to eat eggs, small animals, nuts and insects
D．it rains too often in the deep forests
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