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
Out of courtesy he tried his best to ______ his laughter.
A．oppress
B．depress
C．suppress
D．coerce
单项选择题
Lacking ______ sensibility because of unique upbringing, Monica does not care about right and wrong.
A．amoral
B．immoral
C．moral
D．immortal
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