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【单选题】
某学者再对某湖沼地区做钉螺感染血吸虫的流行病学研究中,收集钉螺标本 2000只,将其分成200个群,每群10只。经检验,这200群中发现120个群是阳性群,则该地区钉螺的血吸虫感染率是( )A.
40%
B.
10.87%
C.
20%
D.
0.5%
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举一反三
【单选题】Which of the following terms is used to refer to the ideas, beliefs, and customs to which people are emotionally attached?
A.
attitudes
B.
memetics
C.
aesthetics
D.
values
【单选题】Refer to the figure above. If A forms a customs union with C, the value of trade diversion will be
A.
$0.
B.
$10,000.
C.
$20,000.
D.
$40,000.
【简答题】Refer to the figure above. If A forms a customs union with B, it will importA. A) 400 units from B. B. B) 200 units from C. C. C) 200 units from each. D. D) 400 units from B and 200 units from C.
【判断题】Customs refer to short-established social rules that are considered acceptableornormalbehavior in any situation.
A.
正确
B.
错误
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