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【单选题】
下列哪项是人工股骨头置换术的绝度禁忌证（）A.
髋关节感染、骨髓炎患者
B.
年龄小于40岁
C.
髋臼破坏严重
D.
髋臼严重退行性变
E.
心肺等器官有严重的疾
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反馈参考答案：
举一反三
【单选题】To survive in the intense trade competition between countries, we must ______ the qualities and varieties of products we make to the world market demand.
A.
improve
B.
enhance
C.
guarantee
D.
gear
【单选题】I’m sure that ____you have told him will make some ____to his decision.
A.
what; difference
B.
that; difference
C.
which; effect
D.
what; effect
【单选题】--- Have you told him we have changed the plan? I _____ have, but I haven’t done it yet.
A.
must
B.
ought to
C.
needn’t
D.
can’t
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