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【单选题】
正常人的眼睛能看清远近不同的物体,主要原因是 [     ]
A.
视网膜可以前后移动
B.
晶状体曲度的调节
C.
眼球前后径的改变
D.
瞳孔的放大或缩小
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【简答题】编写一个 C# 控制台应用程序,对于输入的年份 year ,判断该年份是否为闰年。
【单选题】Over three centuries, more than 10 million African slaves were imported into the Americas.
A.
True
B.
False
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A.
unique
B.
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C.
lighting
D.
blowing
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A.
近距离非接触式技术的应用
B.
第三方支付业务
C.
第二代手机电子钱包支付
D.
“银信通”业务
【多选题】The Czech Republic has a population of more than 10 million, with such ethic groups as ______.
A.
Czechs
B.
Slovaks
C.
Ukrainians
D.
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B.
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C.
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【判断题】水是大自然对人类的恩赐,是一种用之不完,取之不尽的资源。目前水污染严重、水资源短缺虽然很严重,但我们基本可以高枕无忧。
A.
正确
B.
错误
【判断题】Over three centuries, more than 10 million African slaves were imported into the Americas.
A.
正确
B.
错误
【简答题】Averagely, how many people are killed, injured or permanently disabled in car accidents each year according to the passage? A) Three million. B) Eigh million. C) 250,000. D) More than...
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