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【单选题】
肺心病并发呼吸衰竭患者缺氧的典型表现是A.
呼吸困难
B.
发绀
C.
意识障碍
D.
肺功能下降
E.
球结膜水肿
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反馈参考答案：
举一反三
【单选题】_____ foreign friends come to visit China every year. [ ]
A.
Many thousand
B.
Thousands of
C.
Many thousand of
D.
Many thousands
【简答题】简述瘤胃微生物的生理作用。
【单选题】Every year, millions of people visit the Palace Museum, and many of ____ are foreigners. [ ]
A.
them
B.
that
C.
whom
D.
what
【单选题】Every year, _____ fishes are killed by the polluted water and many people are made sick by the polluted air. [ ]
A.
thousand of
B.
thousands of
C.
two thousands
D.
two thousands of
参考解析：
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