单项选择题

A．To measure amounts of rainfall,
B．To check the accuracy of scales.
C．To observe changes in the atmosphere.
D．To calculate the density of other metals.
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单项选择题
A．25 days.B．30 days.C．35 days.D．40 days.
A．25 days.
B．30 days.
C．35 days.
D．40 days.
单项选择题
A．Man knows where the society is going.B．Man can do nothing about the problem of pollution.C．The speaker is worried about the future of our modern society.D．People don’t welcome the rapid development of modern society.
A．Man knows where the society is going.
B．Man can do nothing about the problem of pollution.
C．The speaker is worried about the future of our modern society.
D．People don’t welcome the rapid development of modern society.
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