单项选择题

The insect population increased due to ______.

A．the hot air
B．the tropical climate
C．the rain clouds
D．the damp atmosphere
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单项选择题
In the British Isles the temperature ______.
A．stayed at eighty
B．ranged from eighty to ninety
C．approached one hundred
D．exceeded the hundred mark
单项选择题
By the fourth week of July conditions in the tropics were such that ______.
A．human survival would be impossible
B．more and more people would lose their lives
C．fewer people could be saved
D．survival or death was still undecided
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