单项选择题

It's important to remember that nutrients have to work ______, and to take too much of one or another can be useless or even dangerous.

A．in check
B．in retrospect
C．in concert
D．in vogue
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单项选择题
According to the behaviorists, psychologists have no need to ______ the existence of the mind or of anything else that is not observable.
A．postulate
B．contemplate
C．scheme
D．recommend
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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