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问题 选择题

The telephone rang ______ I was doing my homework last night.        [ ]

A. while            

B. because          

C. until

答案

答案：A

单项选择题 A型题

关于角膜原位癌的描述，下列哪一项是错误的（）

A.好发于角膜缘

B.细胞多边形，核圆形或卵圆形，细胞极性消失，异型性明显

C.瘤细胞尚未突破基底膜

D.病变向深部组织侵犯

E.病程缓慢
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单项选择题

Unless it is unavoidable do not jump from a place higher than 5 meters into the water. Try to minimize the shook of sudden cold immersion. When should the said caution be taken into account?（）.

A.The mariners try to put out fire on board of vessel

B.The people on board try to survive themselves from a ship in perils

C.The salvors take actions to rescue the survivors at sea

D.The pilot come on board from his boat in bad weather
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