单项选择题

A．Buy it.
B．Rent it.
C．Borrow it.
D．Make it.
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单项选择题
A．The disadvantages of working in an office.B．How using a computer can affect one’s eyes.C．Why Tom needs to get glasses.D．Research Tom has done for his chemistry paper.
A．The disadvantages of working in an office.
B．How using a computer can affect one’s eyes.
C．Why Tom needs to get glasses.
D．Research Tom has done for his chemistry paper.
单项选择题
The federal government ______.
A．encourages basic research
B．devotes more than 90% of its research and development funds to applied research
C．spends far more on applied research than on military problems
D．opposes the Foundation's grants to basic research
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