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【单选题】
三尖瓣位于A.
左房室口
B.
右房室口
C.
肺动脉口
D.
主动脉口
E.
口
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【简答题】In the 17th century letters were carried from Britain to European countries by sailing______.
【简答题】“天苍苍，野茫茫，风吹草低见牛羊”描述的是哪个地区? ()
【单选题】Newspaper is one of ______ means of sending news and information.
A.
common
B.
more common
C.
the commonest
D.
the most common
【简答题】“天苍苍，野茫茫，风吹草低见牛羊”的景观描写的是哪里?
【简答题】“天苍苍，野茫茫，风吹草低见牛羊”描述的景观位于我国哪个高原?
【单选题】Many farmers in rich countries moved to cities in the 19th century because of ______ .
A.
a scarcity of farm jobs
B.
the hope of better jobs and life
C.
discriminating economic policies
D.
both A and B
【单选题】Sending man into ______ space is not _____dream for human beings any longer.
A.
/; a
B.
the; a
C.
the; the
D.
/; the
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