By the fourth week of July conditions in the tropics lay balanced between life and total death. Then quite suddenly rain clouds appeared over the whole globe. The temperature declined a little, due no doubt to the clouds reflecting more of the Sun s radiation back into space, But conditions could not be said to have improved. Warm rain fell everywhere, even as far north as Iceland. The insect population increased enormously, since the burning hot atmosphere was as favorable to them as it was unfavorable to Man many other animals.

　　81. 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

　　82. Few people in the United States lost their lives because .

　　A)the temperature was tolerable

　　B)people remained indoors for weeks

　　C)the government had taken effective measures to reduce the hot temperature

　　D)people were provided with the most comfortable air-conditioners

　　83. Millions of people in Cairoand the Cape of Good Hopewere subjected to a choking atmosphere because .

　　A)the temperature grew extremely hot

　　B)the temperature became damper and hotter as the humidity of the surface waters of the sea increased

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