单项选择题

The organ transplant community has______humans and monkeys for ethical reasons.

A．knocked out
B．bailed out
C．pointed out
D．ruled out
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单项选择题
Did the entertainer prepare his jokes before the program, or______them as he went along
A．envisage
B．visualize
C．improvise
D．mediate
单项选择题
Please don’t interrupt me. If you have something to say, ______your comment until I have finished speaking.
A．withdraw
B．wither
C．withhold
D．withstand
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