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【判断题】
( )肉苁蓉来源于列当科。A.
正确
B.
错误
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举一反三
【单选题】In Conversation one: I don't want to make a fuss. Does this mean ?
A.
Janet wants to talk to the doctor about how she's feeling
B.
Janet doesn't want to talk to the doctor about how she's feeling
【单选题】I'd like to be a friend _____you. I don't want to make an enemy ____ you. [ ]
A.
of; of
B.
to; to
C.
to; of
D.
of; to
【简答题】已知向量 a =（x-1，2-y）向量 b =（y-2，x-1），若 a ∥ b ，则x 2 +y 2 =______．
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