单项选择题

How did man manage to survive the "black cloud" in the tropics

A．They hid in caves and cellars.
B．They tried to reduce the temperature.
C．They killed 7943 species of plants and animals.
D．They ate ice so that the body temperature was reduced.
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单项选择题
It can be inferred from the last paragraph that ________.
A．the insect population increased greatly because most other animals were killed by the hot weather
B．compared with human beings and other species, insects prefer hotter and damper temperature
C．compared with previous weeks, the temperature in the fourth week of July. declined a little.
D．the insect population increased greatly because there should be a balance between life and death in the tropics
单项选择题
What does the author imply by saying This is not cheating in the last paragraph
A．Nobody will consider it a cheat to reuse parts from old products in new models.
B．Usually people will feel being cheated when old parts are used in new products they buy.
C．Reusing parts from old products in new models will not be punished because it isn't cheating.
D．Electronics manufacturers should tell customers there are used parts in new products.
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