单项选择题

某患者哮喘急性发作时脉率在100～120次／min，这应属于()的表现

A.轻度
B.中度
C.重度
D.危重

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If Scott had worked harder,he（）the examination last week.

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C.would have passed
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The relation between the two words "buy" and "sell" can be described as（）

A.gradable antonymy
B.converse antonymy
C.complementary antonymy
D.synonymy