单项选择题

The largest portion of children' s television viewing time is spent______.

A．watching weather report
B．playing games on the television set
C．watching adult programs during the evening
D．watching educational program
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单项选择题
From paragraph two, we can infer that ______.
A．Bush forced the National Renewable Energy Laboratory to lay off workers
B．Bush visited the lab (NREL) before the laid-off of 32 workers
C．the 32 workers might be reemployed after Bush' s visit
D．Bush carried $ 5 million cash to the NREL when he visited there
单项选择题
From the passage we know switchgrass is ______.
A．a biochemical product
B．a kind of animal
C．a kind of grass growing very fast
D．a kind of grass growing in a specific soil
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