题海让大学四年没有难题
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单选题 What is the fourth paragraph mainly about?________( )

A. Why daylight prevents people from becoming short-sighted

B. Why daylight is much brighter than indoor light

C. Why natural daylight has a special chemical

D. What the special chemical which can stop eyeballs from growing out of shape is

21世纪大学英语(S版)综合教程3(第2版)课程封面

学科:21世纪大学英语(S版)综合教程3(第2版)

时间:2025-12-21 09:46:56

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