单项选择题

Next time you have a problem, think about how you can improve the situation instead of ______ all the negative aspects.

A．dwelling on
B．counting on
C．barking on
D．touching on
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单项选择题
Unless astronomers ______ their search for extraterrestrial life to stars as exceptional as the Sun, they are wasting much of their time.
A．narrow down
B．boil down
C．tone down
D．let down
单项选择题
In conclusion, walking is a cheap, safe, enjoyable and ______ available form of exercise.
A．recklessly
B．readily
C．potentially
D．amenably
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