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【单选题】
公共产品的特点是（ ）。A.
竞争性和非排他性
B.
非竞争性和排他性
C.
非竞争性和非排他性
D.
竞争性和排他性
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举一反三
【单选题】In ancient China, the rich usually wear colorful clothing ,like yellow, blue, whiter, red, black, while the poor ,they usually wear _____ and ______.
A.
gray, yellow
B.
gray , brown
C.
red, brown
D.
blue, gray
【单选题】I don't want to get ______ in the argument about whom to blame.
A.
interested
B.
involved
C.
absorbed
D.
focused
【单选题】She's having a lot of trouble with the new computer, but she doesn't know whom to ____. [ ]
A.
turn to
B.
look for
C.
deal with
D.
talk about
【单选题】I don't think he is a man ______ .
A.
whom you can believe
B.
that you can believe
C.
whom you can believe in
D.
what you can believe in
【简答题】踢脚板的材料与楼面的材料基本相同，并与地面一起施工，其高度一般为（ ）mm
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