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【单选题】
According to the passage, one of the causes for the difficulties of American higher education is that ______.A.
the government has stopped giving public institutions as much financial support as it used to
B.
America has always been encouraging young people to go to college
C.
many public institutions have replaced private ones
D.
the government only finances such researches as that of placing man on the moon
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tea
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up
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【单选题】1982年某市为了调查老年人中多发病的分布情况,对该市7个区的9个不同地段抽取60岁及以上的老年人6393例进行调查。这是
A.
普查
B.
抽样调查
C.
队列调查
D.
筛检
E.
发病率调查
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A.
发病率
B.
患病率
C.
罹患率
D.
发病专率
E.
存活率
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A.
发病率
B.
患病率
C.
罹患率
D.
存活率
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A.
trade
B.
skill
C.
trick
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technology
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