单项选择题

The world's first internet ______ has been cancelled because of lack of interest.

A．climax
B．peak
C．summit
D．tip
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单项选择题
Weld's hopes of assisting homosexual couples to adopt children will require the law to ______ the roles and customs of the child welfare organizations that now administer adoption.
A．override
B．overtake
C．overdraw
D．overwhelm
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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