单选题 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

【正确答案】 D

【答案解析】[试题分析] 事实推理题。
[详细解答] 最后一段指出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，所以，选择D更为恰当。