单项选择题

Peering through the darkness, the traveller could _______ lights in the distance and then he doubled his pace.

A．perceive
B．discern
C．recognize
D．visualize

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单项选择题

For the past few years Susan had been _______ her income by the creation of fiction under a pen name.

A．extending
B．magnifying
C．exceeding
D．supplementing

单项选择题

We must take _______ measures to protect the natural environment, otherwise, one million species that are alive today will have become extinct.

A．sharp
B．drastic
C．dramatic
D．sturdy

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