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【单选题】

连接地中海和大西洋的海峡是( )。

A.
巴士海峡
B.
马六甲海峡
C.
麦哲伦海峡
D.
直布罗陀海峡
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举一反三

【单选题】地中海性贫血的发病机制为

A.
造血干细胞增生和分化异常
B.
遗传性HB合成异常
C.
慢性失血
D.
获得性红细胞膜缺陷
E.
遗传性红细胞膜缺陷

【单选题】Passage2Questions 21 to 25 are based on the following passage:People travel for a lot of reasons. Some tourists go to see battlefields or religious shrines. Others are looking for culture, or simply w...

A.
they want to see historic remains or religious spots.
B.
they are interested in different cultural traditions and social customs.
C.
they would like to take pictures in front of famous sites.
D.
they wish to escape from the cold, dark and rainy days back at home.