单项选择题

A．Ask the stewardess for change.
B．Move to another part of the plane.
C．Sit where there is a breeze.
D．Extinguish his cigarette.
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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
Less developed countries ______.
A．devote a large portion of their budget to applied research
B．realize that progress depends on basic research
C．encourage their career scientists to experiment
D．devote less than 70% of their scientific budget to basic research
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