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鸟类上下颌骨极度前伸，构成鸟喙，鸟喙外具角质鞘，构成锐利的切缘或钩，是取食器官。()A.
正确
B.
错误
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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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