问题 问答题

炎热的夏季,小明和同学们在沙滩上玩耍.他发现了下列几种现象:

(1)看到远处高楼墙面光线柔和,而玻璃窗很刺眼.

(2)经过花店,闻到花香特别的浓;

(3)乘车时,汽车一刹车,身体向前倾斜;

(4)风一吹,室内的窗帘飘出窗外.

请你运用2个物理知识,分别解释上述场景中的相关现象.

答案

答:(任意选择两个答案)

(1)场景:看到远处高楼墙面光线柔和,而玻璃窗很刺眼.

解释:光射到高楼的粗糙墙面时,墙面发生漫反射,进入眼睛的光线比较少,感觉光线柔和;光射到玻璃窗上,玻璃窗发生镜面反射,进入眼睛的光线比较多,感觉比较刺眼.

(2)场景:经过花店,闻到花香特别的浓.

解释:经过花店时,花的芳香分子运动到空气中,发生了扩散现象,闻到花香.

(3)场景:乘车时,汽车一刹车,身体向前倾斜.

解释:汽车行驶时,人和汽车一起运动,汽车一刹车,脚和汽车地板之间由于摩擦而停止运动,上身由于惯性要保持原来的运动状态,身体向前倾斜.

(4)场景:风一吹,室内的窗帘飘出窗外.

解释:风一吹,窗外空气流速增大,空气压强减少,室内空气压强大于室外压强,窗帘被压向窗外.

完形填空

完形填空(时间:10分钟)

Several years ago, well-known writer and editor Norman Cousins became very ill. His body ached and he felt constantly tired. It was difficult for him to even __21__ around. His doctor told him that he would lose the ability to move and eventually die from the disease. He was told he had only a 1 in 500 chance of survival.

Despite the diagnosis(诊断), Cousins was __22__ to overcome the disease and survive. He had always been interested in medicine and had read a book, which discussed the idea of how body chemistry and health can be damaged by emotional stress and negative __23__. The book made Cousins think about the possible __24__ of positive attitudes and emotions. He thought, “Is it possible that love, hope, faith, laughter, confidence, and the __25__ to 1ive have positive treatment value?”

He decided to concentrate on positive emotions as a way to treat some of the symptoms of his disease. In addition to his traditional medical treatment, he tried to put himself in situations that would __26__ positive emotions. “Laugh therapy” became part of his treatment. He __27__ time each day for watching comedy films, reading humorous books, and doing other activities that would draw out _28__ emotions. Within eight days of starting his ‘‘laugh therapy” program his pain began to __29__ and he was able to sleep more easily. He was able to return to work in a few months’ time and _30__ reached complete recovery after a few years.

21. A. run                    B. pass                         C. move                              D. travel

22. A. able                    B. determined              C. willing                            D. positive

23. A. attitudes             B. beliefs                      C. goals                              D. positions

24. A. shortcoming        B. harm                        C. benefit                                   D. interest

25. A. emotion                     B. pain                        C. fear                                D. will

26.A. bring about         B. set about                  C. put up                             D. make up

27.A. afforded             B. appointed                 C. offered                           D. arranged

28.A. positive                     B. approving                 C. strong                             D. mixed

29.A. escape                B. decrease                   C. shrink                             D. end

30.A. generally            B. especially                 C. actually                           D. presently