单项选择题

[f]and[v]can be distinguished by______.

A．manner of articulation
B．place of articulation
C．vibration of the vocal cords
D．aspiration of articulation
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单项选择题
_____your valuable help, we couldn’t have finished the experiment ahead of time.
A．If it were not for
B．Had it not been for
C．Were it not for
D．If it has not been for
单项选择题
Such animals as South China tigers are believed______, for we’ve had no track of them for ages.
A．becoming extinct
B．to become extinct
C．to have been extinct
D．having been extinct
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