单项选择题

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
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.
单项选择题
Scientist Ram Oren is of the opinion that common beliefs of the tree' s ability to absorb carbon dioxide are ______.
A．biased
B．insightful
C．overoptimistic
D．totally wrong
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