(2013·福建毕业班质量检查)—What does PM 2.5 mean?—It's a professional ________ indicating the condition of air pollution.
#11739
A
term
B
item
C
number
D
mark
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He used to be a successful businessman, but drug ____ his ruin.
#12415
A
attended to
B
contributed to
C
resulted from
D
devoted to
— How are you, my dear?— Not so well. I've ___ the flu.
#13586
A
looked up to
B
dropped in on
C
come down with
D
gone in for
We’d better _________ when he is thinking, as he prefers to solve problems on his own. 
#13434
A
wake him up
B
set him aside
C
leave him alone
D
ring him up