单项选择题

Though he views himself as a realist, Cetron says that his findings make him very ______ about future.

A．optimistic
B．sympathetic
C．objective
D．precautious
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单项选择题
The guests said that they wouldn't mind ______.
A．to have a little light music
B．if they have a little light music
C．having a little light music
D．that they have a little light music
单项选择题
The ratio of the work done by the machine ______ the work done on it is called the efficiency of the machine.
A．against
B．with
C．to
D．for
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