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【判断题】
用等高线表示地面时，山谷的等高线是一组凸的曲线。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】You can do what you are told when receiving a promotional mailing telling you a travel prize is waiting for you to get.
A.
Y
B.
N
C.
NG
【单选题】When receiving treatment, patients are always
A.
active by challenging the doctors' decision.
B.
passive without questioning anything.
C.
satisfied with the treatment.
D.
disobedient to the doctors' persuasion.
【单选题】____ the cylinder walls, the heat passes through them by conduction.
A.
When receiving by
B.
When received by
C.
In order to receiving
D.
In order to receive
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