题干

“影”是生活中常见的光现象,如做光学游戏的“手影”,留下美好记忆的照片“摄影”,幻灯机射到屏幕上的“投影”,湖岸景色在水中形成的“倒影”等,下列的“影”与物理知识对应关系正确的是(  )

A:手影﹣﹣平面镜成像  

B:摄影﹣﹣光的反射

C:投影﹣﹣凸透镜成像

D:倒影﹣﹣光的折射

上一题 下一题 0.0难度 选择题 更新时间:2019-09-16 12:37:56

答案(点此获取答案解析)

C

同类题4

完成短文

    Once my mother told me a story. In Africa, when an antelope (羚羊) wakes up every morning, the first thing it thinks about is, “I must be able to run faster than the fastest lion, or I will be k____.” At the same time, a lion wakes from his dream. The first thing the lion thinks about is, “I must be able to catch the ____antelope, or I will die of hunger .” So almost at the same time, the antelope and the lion get up and start running toward the rising sun.

This is life: full of chances and challenges. Whether you are an antelope or a lion, you must go a____when the sun rises. For students, it is just the same. If we don't study hard, sooner or later, we will fall b____the other students. At first, I didn't know what the word “exam” meant. Later, I knew an exam was a kind of competition. In competitions, there are always w____ and losers. As I grew up, I got to know “competition”. In one's life, there must be competitions, so people can improve.

    Each time I saw children playing games and heard their laughter, I wished I were that age again. However, I remembered my parents' words: “You must work very hard in order to have a good f____. ” So I picked up my pen and began to study hard again.

    I was still not sure what competition really meant. One day, I was taking part in an English-speaking competition. When I went to the stage, I saw other students looking at me kindly. I s____ knew what competition was. It is not as cruel as my teacher and parents told me. In fact, competition is the opposite: it is kind and necessary.

    I learned a lot from realizing this . Now I understand better about the world. Competition is important for us all.

同类题5

阅读下面的文言文,完成下列小题。

    易字希白。始,父倧嗣吴越王,为大将胡进思所废,而立其弟俶。俶归朝,群从悉补官。易与兄昆不见录遂刻志读书昆字裕之举进士为治宽简便民能诗善草隶书累官右谏议大夫以秘书监于家

    易年十七,举进士,试崇政殿,三篇,日未中而就。言者恶其轻俊,特罢之。然自此以才藻知名。太宗尝与苏易简论唐世文人,叹时无李白。易简曰:"今进士钱易,为歌诗殆不下白。"太宗惊喜曰:"诚然,吾当自布衣召置翰林。"值盗起剑南,遂寝。真宗在东宫,图山水扇,会易作歌,赏爱之

    易再举进士,就开封府试第二。自谓当第一,为有司所屈,乃上书言试《朽索之驭六马赋》,意涉讥讽。真宗恶其无行,降第二。明年,第二人中第,补濠州团练推官。召试中书,改光禄寺丞、通判蕲州。奏疏曰:"尧放四罪而不言杀,彼四者之凶,尚恶言杀,非尧仁之至乎?古之肉刑者劓、椓、黥、刖皆非死,尚以为虐。近代以来,断人手足,钩背烙筋,身见白骨而犹视息,四体分落乃方绝命。以此示人,非平世事也。今四方长吏竞为残暴,婺州先断贼手足,然后斩之以闻。使严刑可诫于众,则秦之天下无叛民矣。臣以谓非法之刑,非所以助治,惟陛下除之。"帝嘉纳其言。

    景德中,举贤良方正科,策入等,除秘书丞、通判信州。东封泰山,献《殊祥录》,改太常博士、直集贤院。祀汾阴亳州,命修《车驾所过图经》,献《宋雅》一篇,迁尚书祠部员外郎。坐发国子监诸科非其人,降监颍州税。数月,召还。久之,判三司磨勘司。真宗雅眷词臣,其典掌诰命,皆躬自柬拔。擢知制诰、判登闻鼓院、纠察在京刑狱。累迁左司郎中,为翰林学士,儤直未满,卒。仁宗怜之,召其妻盛氏至禁中,赐以冠帔。

(节选自《宋史•列传第七十六》,有删改)