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【多选题】
以下哪些情况是导致先天性视觉障碍的原因？（ ）A.
先天性白内障
B.
家族性视神经萎缩
C.
视网膜色素变性
D.
玻璃体病变
E.
意外事故导致的眼部伤残
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反馈参考答案：
举一反三
【简答题】已知m+n=2008（m﹣n），则 =（ ）。
【单选题】Why did Dr. Smith choose to settle down in a village in the Himalayan?
A.
It has less poverty, dirt and ignorance.
B.
The villagers treated him very friendly.
C.
It is cooler.
D.
It's a typical village.
【简答题】Comprensione del testo: "Il fagiolo magico" Giacomino vive con la madre in una fattoria. La povertà è di casa: possiedono soltanto una mucca da cui ricavano il latte. Un giorno la madre manda Giacomin...
【简答题】已知：m+ 1 m =3，则m 2 + 1 m 2 =______；已知：a+b=5，ab=-10，则a 2 +b 2 =______．
【简答题】America is a great country for many. Yet America may not be so great for many others. In contrast to China, it has a relatively much smaller population living on a piece of land rich with natural reso...
【单选题】Which of the following is NOT the cause of a persons incuriousness?
A.
Bad Teaching.
B.
Poverty.
C.
Hard labor.
D.
Age.
【简答题】已知sin（π-α）=m，（|m|≤1），则cos[2（π+α）]=______．
【简答题】何为渠化交通?其作用如何?
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