单项选择题

If English is not our first language you can often be puzzled by ways of expression that the native speakers of English does not even have to______.

A．think out
B．think about
C．think over
D．think for
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单项选择题
The body apparently resents being dosed with unusual amounts of a vitamin or mineral and its first______ is to excrete them.
A．reaction
B．impulse
C．response
D．instinct
单项选择题
In a sense tennis and Taijiquan are similar in that they both require your full attention and if done______ , take your mind off daily problems and preoccupations.
A．successfully
B．consecutively
C．conscientiously
D．compulsorily
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