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【单选题】
下肢静脉曲张的主要原因是A.
心脏功能不全
B.
皮下脂肪减少
C.
静脉瓣膜破坏
D.
下肢肌肉收缩减退
E.
胸腔负压作用减低
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【单选题】Though ________ in a big city, Bill always prefers to sing the songs of country life.
A.
bringing up
B.
grown
C.
raised
D.
Keeping
【单选题】Though________up in a big city,Bill always prefers to live a country life. [ ]
A.
brought
B.
was brought
C.
bringing
D.
having brought
【简答题】A．Bill prefers music to English lessons. B．Bill wants to be a musician in the future. C．Bill shows more interest in English learning, D．Bill doesn't make enough effort in English learning.
【简答题】鞭毛是细菌的运动器官,下列哪种方法可用来判断细菌是否有鞭毛( )。A. 拴菌实验 B. 鞭毛染色 C. 半固体穿刺培养 D. 以上都是
【判断题】Bill Katz prefers more of good 1 to less and he prefers less of good 2 to more. Bill has convex preferences. If we draw his indifference curves with good 1 on the horizontal axis and good 2 on the ver...
A.
正确
B.
错误
【单选题】______ for several times, Bill made up his mind not to play computer games at night any more.
A.
To be scolded
B.
To have been scolded
C.
Being scolded
D.
Having been scolded
【单选题】算法的描述可以用自然语言,下面说法中正确的是( )。
A.
所谓自然语言描述算法就是用人类语言加上数学符号，来描述算法
B.
用自然语言描述算法有时存在 “ 二义性 ”
C.
自然语言用来描述分支、循环不是很方便
D.
以上说法都错误
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