单项选择题

Water is an essential global resource and it is up to each of us to ______ it.

A．preserve
B．maintain
C．reserve
D．conserve
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单项选择题
Divorce should not be the only solution. You may work ______ your personal differences and similarities first.
A．out
B．in
C．off
D．on
单项选择题
She takes ______ her father closely, said the surprised neighbor who has not seen her for 10 years and recognized her at once.
A．aback
B．apart
C．down
D．after
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