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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单项选择题
How many instruments are mentioned in the passage
A．Two.
B．Three.
C．Four.
D．Five.
单项选择题
The author believes that the trumpet is particularly important because it ________.
A．can be used in rock bands
B．has historical significance
C．is a religious instrument
D．has a narrow range
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