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【单选题】
某研究欲评价水痘疫苗的流行病学效果,经随访调查发现,400名接种水痘的儿童中有10人发病,600名对照组儿童中有90人发病,该水痘疫苗的保护率是A.
0.8
B.
0.9
C.
0.925
D.
0.833
E.
0.785
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举一反三
【单选题】What is the main topic of the news item?
A.
Methane explosion in Turkey.
B.
Miscounting of the people died in the accident.
C.
Terrible working conditions of coal miners.
D.
The worst mining disaster in history.
【单选题】Immediately before he hit his head on the board, the writer __________.
A.
climbed the ladder
B.
started the moves that would thrust him into the air
C.
knew he was too close to the board
D.
corrected his actions when he turned
【单选题】Questions 1 and 2 will be based on the following news item.
A.
Methane explosion in Turkey.
B.
Miscounting of the people died in the accident.
C.
Terrible working conditions of coal miners.
D.
The worst mining disaster in history.
【简答题】A. Richard J. Braun Richard J. Braun, MBA, JD, CPA, was named Chairman of the Board of Directors and President on October 26, 2000. Mr. Braun was named a Director and elected as Chief Executive Office...
【简答题】A．He was told that he had boarded the wrong plane. B．He was not allowed to board the plane he should take. C．He arrived at the airport without ticket or luggage. D．He found it difficult to explain why...
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