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【单选题】
下列说法正确的是A.
色觉是视网膜视杆细胞的一种功能，属于黄斑的功能
B.
色盲分先天性和后天性两种。先天性多见于性连锁隐性遗传病，女多于男
C.
暗光的辨认是视网膜视锥细胞的功能，分布于周边视网膜，接受暗光刺激产生视兴奋
D.
在外界无光线刺激下出现的视觉称闪光视觉，常见于视网膜脱离、急性视网膜脉络膜炎、眼球外伤
E.
视物变形指物像扭曲变形，或变大或变小。常发生于视网膜病变患者，如视网膜皱缩患者之视物变形变小
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A.
Were
B.
will be
C.
have been
D.
had been
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A.
more major corporations are moving out of state than moving in
B.
it lacks the right environment required for nurturing qualified leaders
C.
there is something seriously wrong with is education
D.
the state leadership is not adequately represented by different ethnic groups
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【单选题】---Why is the little boy crying over there? -----He is too short to reach ___ the toy bear ___ the toy car on the shelf?
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both …and
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neither….nor
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not…but[
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