单项选择题

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

A．Buy something in the Bill supermarket.
B．Get money to pay his bill.
C．Check to see whether he can pay in cash.
D．Get a check for the woman.
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单项选择题
What is the purpose of this passage
A．Introduce some new ideas about the relationship between trees and carbon dioxide.
B．Introduce recent condition of global industrial pollution.
C．Call on people to plant more trees to reduce greenhouse gases.
D．Point out that power companies should be responsible for the rising levels of carbon dioxide.
单项选择题
Why researchers put trees in extra carbon dioxide in the first study
A．To learn whether trees can still absorb carbon dioxide under extreme conditions.
B．To get more oxygen from these trees.
C．To evaluate the maximum carbon dioxide that trees can absorb.
D．To see the growth rate of these trees.
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