题目

下列关于光的说法中正确的是（） A . “小孔成像”和“水中倒影”都是光的反射现象 B . 红外线能使荧光物质发光，紫外线具有热效应 C . 在平面镜成像实验中，需要选择薄的玻璃片进行实验，是为了能确定像的位置 D . 我们所看到的“红花绿叶”，那是由于花吸收了红光、叶子吸收了绿光 答案：C 阅读理解 　　Physics is a different world now． Will there ever be another Einstein? 　　Scientists say a new Einstein will appear, but it may take a long time． After all, more than 200 years separated Einstein from his nearest rival(对手) ,Isaac Newton． 　　Many physicists say the next Einstein hasn't been born yet, or is only a baby now． That's because the searching for a unified (统一的) theory that would explain all the forces of nature has pushed current mathematics to its limits． New math must be created before the problem can be solved 　　But researchers say there are many other factors working against another Einstein appearing anytime soon． 　　For one thing, physics is quite a different field today． In Einstein's day, there were a few thousand physicists worldwide, and fewer theoreticians． 　　Education is different, too． One extremely important aspect of Einstein's training that failed to consider is the philosophy he read as a teenager． It taught him how to think theoretically about space and time． 　　And he was a skilled musician． The interplay between music and math is well known． Einstein would fiercely play his violin as a way to think through a knotty physics problem． 　　Today, universities have produced millions of physicists． There aren't many jobs in science for them, so they go to Wall Street and Silicon Valley to apply their analytical skills to more practical and rewarding efforts． 　　Besides, those who stay in science don't work alone． It's very difficult to imagine an independent person like Einstein ever tolerating this． (1) Which of the following best explains why the next Einstein hasn't been born yet? [　　] A． Education today doesn't pay enough attention to philosophy teaching． B． It isn't known who will be another Einstein among newly-born babies． C． Math today is limited and cannot help the further development of physics． D． There were more physicists in Einstein's time than today． (2) One of the reasons that made Einstein a great scientist is ________． [　　] A． the lack of physicists in his day B． the philosophy he read in his teens C． learning from Isaac Newton D． not going to work at Wall Street (3) The underlined word "knotty" here probably means ________． [　　] A． interesting and useful B． important and meaningful C． realistic and hard D． difficult and puzzling (4) From Paragraph 3 to Paragraph 6,how many reasons does the writer give for why another Einstein hasn't appeared? [　　] A． One． B． Two． C． Three． D． Four．