题干

关于下面四幅图所对应的光学现象,下列说法正确的是(   )

A:甲图可能是单色光形成的双缝干涉图样

B:在乙漫画中,由于光的折射,鱼的实际位置比人看到的要深一些

C:若丙图是光从玻璃射入空气中时的光路图,则其入射角是30°

D:丁图为一束由红光、紫光组成的复色光c射入半球形玻璃体后分成光束a、b的光路图,可知其中a为红光

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答案(点此获取答案解析)

B,C

同类题2

用方框中所给单词的适当形式填空,(每个单词限用一次)。

feel   build  true   because   in frond of   behind   make  hard   a little   grade   sound     yes

       Is it good to be in the middle? Sometimes, no, like when you’re in the middle seat on a long car ride. But sometimes, ____, like when you’re in the middle of a great movie. What will happen next? Middle school is ____ bit like that.

     Middle school is called middle school ____  it’s in the middle of your school years. Elementary school is ____ you. High school and possibly college still await(等待) you. Middle school often includes sixth, seventh, and eighth ____, but you might go to middle school earlier or later, depending on how it's done in your area.

    For a kid, going to middle school is often a big change:

       ·First, it often means moving to a new ____, which takes some time to adjust(调整) to.

      ·Second, it may mean taking a different bus, with different students.

      ·Third, the friends you ____ in elementary school may end up going to different middle schools.

    All that can make you ____ a bit scared on the first day of school.

    Other things that probably will be different are the teachers and the work. Have you heard that middle school teachers are really mean and the homework is really, really ____? Oh, dear. We've heard those, too, but usually they’re not ____. Yes, you'll like some teachers better than others, but middle schools are not special for teachers!