单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Type the document at night.
B．Go to the printing room with her.
C．Fix his computer.
D．Type the document on her computer.
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单项选择题
Ecologists call Canada’s 1.2 million square miles of trees lungs of the planet for ______.
A．they balance the world temperatures
B．they are abundant to cleanse the earth’s atmosphere and play an important role in cleansing the earth’s atmosphere
C．they could always suck in vast quantities of carbon dioxide
D．they naturally cleanse much of the harmful heat-trapping gas
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