单项选择题

The flower bud of a water lily opens at sunset since its opening is triggered by the decreased light.

A．alleviated
B．endured
C．set off
D．covered op
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单项选择题
For companies, the threat of drive-by hacking seems set to grow as software programs assisting hackers proliferate on the Internet.
A．obliterate
B．multiply
C．stack
D．precipitate
单项选择题
Modern printing equipment quickly turns out duplicate copies of textual and pictorial matter.
A．identical
B．excessive
C．illustrated
D．legible
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