单项选择题

A．It served as a fertilizer for crops.
B．It formed a new mountain.
C．It stabilized air temperatures.
D．It destroyed various insect pests.
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单项选择题
To make your humor work, you should ________.
A．take advantage of different kinds of audience
B．make fun of the disorganized people
C．address different problems to different people
D．show sympathy for your listeners
单项选择题
A．They stay closed until summer comes.B．They cater chiefly to tourists.C．They are busy all the year round.D．They provide quality service to their customers.
A．They stay closed until summer comes.
B．They cater chiefly to tourists.
C．They are busy all the year round.
D．They provide quality service to their customers.
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