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【单选题】
寄生虫病在一个地区流行必须具备的三个基本条件是A.
传染源、传播途径、易感者
B.
充足的阳光、温暖的气候、潮湿的土壤
C.
传染源、中间宿主、易感者
D.
落后的经济、稠密的人口、较差的卫生条件
E.
传染源、传播途径、人口老年化
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【单选题】听力原文： It may seem strange to date the emergence of a global economy in 1973, since that was the year of the first oil shock. The price of a barrel of oil was raised dramatically, leading to a slump in...
A.
The drop in economies of industrialized nations caused by the rise of oil price.
B.
The cease of the United States' dominant position in the world economy.
C.
The competition from Western Europe and Japan to the U. S. in international trade.
D.
All of the above.
【单选题】____ seems strange to us is ______ she can sing so many English songs beautifully.
A.
It; that
B.
That; how
C.
It; Why
D.
What; that
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