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
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单项选择题
Deforestation is______ one of the most serious environmental issues of our time.
A．explanatorily
B．doubtfully
C．compatibly
D．arguably
单项选择题
The speculation,______ by some suggestive evidence, came from an American scientist.
A．summed up
B．backed up
C．added up
D．put up
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