单项选择题

How did men 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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热门试题

单项选择题

According to the passage, one of the problems for pupils entering secondary schools is that ________.

A．they are taught by many different teachers
B．they do not attend lessons in every subject
C．the teachers do not want to be friendly
D．the teachers give most attention to the more academic pupils

单项选择题

In secondary schools every pupil having problems should ________.

A．know how to ask for help
B．be free from any pressure of academic work
C．be able lo discuss his problems in class
D．be able to discuss his problems with certain teachers