题目

实验小组甲在“探究光的折射现象”时，光线从空气斜射入玻璃中，发生了折射现象，从甲图中可以看出折射角 r 小于入射角 i。实验小组乙同学意外发现：当光沿某方向从半圆玻璃砖折射进入空气时，折射光消失而反射光却变得更亮，如图乙。老师告诉他们这是光的全反射现象。课后，小明同学查到光从玻璃射向空气时的一些数据如下表。 入射角i 0° 10° 20° 30° 40° 41.2° 41.8° 42° 折射角r 0° 15.2° 30.9� 阅读理解 　　Just like any relationship, best friendships depend on trust, promise, respect and interests．When any of these elements(要素)is missing, the friendship will be hard to go on．If the trust is totally broken, you may not be able to forgive him/her．Sometimes a friendship ends because either you or your friend gets tired of putting the heart into it．This can happen when one of you finds a new friend or even a new hobby that takes up much time．Or, perhaps you find the relationship is always going in an unhealthy way and you want some distance．Other times, you simply change and want to leave each other．Sure, it seems sad at the time, but it's completely normal．Not all friendships are meant to last forever．So, what should you do if something like this happens to you?Read on for some friendly advice． 　　Whatever the reason you're breaking up with your best friend, always remember that he/she was once super important to you．Take the time to sit down privately and tell him/her what's going on and why．Don't send him/her an unpleasant e-mail or just start ignoring(不理睬)him/her．In fact, maybe he/she has known there's a problem and would be willing to have a heart-to-heart chat．If you're not sure about wanting an end forever, you could suggest you two take a break from each other．If, after a while, you realize why you became the best friends in the beginning, you can try getting back to your former behaviors．Whatever you do, be honest about your feelings while having respect for his/hers．And if you both agree the BFF thing is over, make sure not to be enemies． (1) What is NOT the usual cause of ending a friendship? [　　] A． Getting tired of putting your heart into each other． B． Finding a new hobby that takes up much time． C． Realizing the relationship going in an unhealthy way． D． Living too for away from each other． (2) The underlined letters BFF probably means ________． [　　] A． 永远的朋友 B． 永久的隔阂 C． 终结的友谊 D． 暂时的误解 (3) What canbe the best title for this passage? [　　] A． Four basic elements of friendship B． Friendly advice on reading C． What to do with friendship in trouble? D． When to be friends or enemies? (4) What should you do when breaking up with your best friends? ①Remember his or her once being important to you． ②Try to have a heart-to-heart chat with him or her． ③Be honest and respectful to each other． ④Send an unpleasant e-mail and ignore him or her． ⑤Suggest not getting along with each other for a while． [　　] A． ①②③④ B． ②③④⑤ C． ①③④⑤ D． ①②③⑤