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【单选题】
为达到置换病室内空气的目的,一般每次通风的时间是A.
10分钟
B.
60分钟
C.
90分钟
D.
20分钟
E.
30分钟
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
The two models of cars.
B.
The history of car industry.
C.
The development of cars in America.
D.
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【单选题】When was the deadly avian flu first discovered in humans in the world?
A.
1997.
B.
1998.
C.
2003.
D.
2004.
【单选题】When the first English settlers arrived in the New World, the Indians _______ jewelry made of animal bones greeted them warmly.
A.
wearing
B.
to wear
C.
worn
D.
having worn
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