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【单选题】
“若x、y，则xy=0”的否命题为（ ）A.
若x、y全不为零，则xy=0
B.
若x、y全不为零，则xy≠0
C.
若x、y不，则xy=0
D.
若x、y不，则xy≠0
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反馈参考答案：
举一反三
【单选题】Which phrasal verb means stop working correctly?
A.
fall for
B.
try out
C.
break down
【单选题】Which phrasal verb means think of an idea?
A.
catch up on
B.
come up with
C.
look up to
【简答题】测量或评定表面粗糙度时所规定的一段基准线长度叫做______。
【单选题】Which of the following explanation does not refer to the phrasal verb " break down"?
A.
a machine or vehicle stops working properly due to a problem
B.
a system, relationship or discussion fails owing to a problem or disagreement
C.
to break down a statement or idea to separate it into smaller parts in order to make it easier to understand or deal with
D.
coming apart
【单选题】The phrasal verb 'rounding up' in paragraph 1 could be best replaced by __________. 查看材料
A.
capturing
B.
encircling
C.
separating
D.
frightening
【单选题】The phrasal verb fatten up in paragraph 6 could be best replaced by______.
A.
invent
B.
rewrite
C.
polish
D.
complete
【简答题】phrasal verb
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