单项选择题

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

A．At a shopping center.
B．At an international trade fair.
C．At a digital counter in a supermarket.
D．At an electronics company.
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单项选择题
Different from animals, the trees influence the earth’s atmosphere by ______.
A．expelling carbon dioxide from their leaves
B．expelling oxygen from their leaves
C．directly reduce the blanket of gases
D．turning some carbon dioxide into lignin
单项选择题
The earth is unfrozen today with the appearance of ______.
A．the methane blanket
B．a mile-thick layer of ice
C．new life forms
D．the carbon dioxide
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