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问题
单项选择题
客房设备使用3-5年左右，应对设备进行（）。
A.常规修整
B.部分更新
C.全面更新
D.彻底保养
答案
参考答案：
B
选择题
It is believed that a new kind of drug _____ by the scientists and they are hopeful that they will succeed in a couple of months.
A. has been developed
B. is being developed
C. is developing
D. has developed
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问答题 简答题
上肢骨和下肢骨各包括哪些骨？
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