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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单项选择题
Scientists have made a __________ in their combat against the AIDS.
A．breakup
B．breakdown
C．breakthrough
D．breakout
单项选择题
The members of the club voted to __________ the constitution in order to enjoy more privilege.
A．assimilate
B．concede
C．amend
D．confer
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