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问题 单项选择题

股骨上端化脓性骨髓炎容易并发化脓性髋关节炎的主要原因是

A．多发生在儿童
B．髋关节活动多，负重大
C．由于骨骺已融合
D．股骨颈血运不良，抵抗力低
E．股骨颈位于关节囊内

答案

参考答案：E

选择题

Tom prefers to stay at home and have a good rest rather than _____ abroad for a holiday. [ ]

A. travel

B. to travel

C. traveling

D. travels
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单项选择题

Which of the following is least likely to affect the elasticity of supply for a good（）

A. The time frame for making the supply decision.

B. The uniqueness of production inputs.

C. The relative amount of income spent on the good.
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