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
The body also needs daily doses of sunlight to help ______ Vitamin D, crucial for maintaining body functions and for the health of muscles and bones.
A．incorporate
B．synthesize
C．integrate
D．assimilate
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
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