单项选择题

"Where can I find Jim" "He is ______ his work. He won’’ t leave the lab until 6:00 p. m."

A．on
B．over
C．at
D．under
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单项选择题
Sometimes, changing our way of thinking, ______.
A．the problems become simpler and clearer
B．we will find the problems simpler and clearer
C．the simpler and clearer the problems will become
D．the problems will become simple and easy
单项选择题
An energy tax would curb ordinary air pollution, limit oil imports and cut the budget ______
A．disposition
B．discrepancy
C．defect
D．deficit
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