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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单项选择题
These young people have much to be dissatisfied with, and they sometimes do______, but on the whole they study hard, knowing the problems the states is facing.
A．grumble
B．frustrate
C．frown
D．perplex
单项选择题
It is true that there are still abundant reserves of metals which have not yet been______, but it is necessary to take steps to ensure that alternative materials are substituted whenever possible.
A．utilized
B．mobilized
C．acquired
D．cultivated
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