下列有关光现象的说法中，正确的是 A．白光是由色光组成的 _爱下问搜题

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问题选择题

下列有关光现象的说法中，正确的是

A．白光是由色光组成的

B．用于矫正远视眼的眼镜片是凹透镜

C．光穿过大气层时沿直线传播

D．光在真空中的传播速度是3×10⁸km/s

答案

答案：A

题目分析：A、白光是由红、橙、黄、绿、青、蓝、紫七种色光组成的；所以A正确；

B、用于矫正远视眼的眼镜片是凸透镜；用于矫正近视眼的眼镜片是凹透镜；所以B错误；

C、大气层里的空气是不均匀的，光穿过大气层时会发生折射；所以C错误；

D、光在真空中的传播速度是3×10⁸m/s，所以D错误

点评：本题考查的光现象知识点比较多，主要考查学生对所学物理知识的灵活应用能力

阅读理解

语法填空

In the international business there is always a great need for creative talents.On the other hand creative

people are also searching for areas 1._____ they can put their talents to use.A talent to be noticed

nowadays is much 2._____ (easy) than it used to be in the old times.In the early days,for example,if one

wanted to be a singer,he or she had to have a great amount of talent in singing.That was the only way they

could promote 3._____ and be recognized.Now sources like the Internet help a great deal in promoting

oneself.The Internet is like a global village.4._____ (seat) in your home you are capable 5._____ finding a

lot of sources.People with 6._____ (vary) of talents can be recognized through the Internet.7._____,the

Internet is 8._____ opportunity to put forward one's talents,creativity,and powers in order to be noticed.

Keeping in mind 9._____ a talent unexposed is the talent unfound.Now we are lucky enough to show

our 10._____ (hide) talents,without trying very hard and just by sitting at home.

填空题

孔板、喷嘴都是根据（）原理来测量的。