单项选择题

Scientists have made a __________ in their combat against the AIDS.

A．breakup
B．breakdown
C．breakthrough
D．breakout
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单项选择题
The most effective way to cope with the language problems while a foreign play is performed is __________ translation.
A．instantaneous
B．simultaneous
C．spontaneous
D．homogeneous
单项选择题
The __________ of temperature will make a difference in the sex of baby crocodiles.
A．diversions
B．modifications
C．variations
D．texture
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