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Light travels at a speed which is about a milliontimes faster than the speed of sound. You can getsome idea of this difference by watching the start ofa race. If you stand some distance away from thestarter, you can see smoke from his gun before thesound reaches your ears.
This great speed of light produces some strangefacts. Sunlight takes about 8 minutes to reach us. Ifyou look at the light of the moon tonight, rememberthat the light rays left the moon 1.3 seconds beforethey reached you. The nearest star is so far away that the light that you can see from it tonightstarted to travel towards you four years ago at a speed of nearly 2 million km. per minute. Insome cases, the light from one of tonight’s stars had started on its journey to you before youwere born.
Thus, if we want to be honest, we can’t say, “The stars are shining tonight.” We have tosay instead, “The stars look pretty. They were shining four years ago, but their light has onlyjust reached the earth.”
1. Light speed is ______ sound speed
A. as fast as B. a million times slower than
C. about millions of times faster than D. about a million times faster than
2. If you stand 200 metres away from a man who is firing a gun to start a race, you will findout that ______.
A. you can hear the sound before you see the smoke B. the sound does not travel as fastas light
C. the sound will reach you before the man fires D. sound travels about a million timesfaster than light
3. Sunlight obviously (明顯地) ______ than the light of the moon
A. has to travel a greater distance B. moves less quickly
C. travels much more quickly D. is less powerful(有力的)
4. The scientific way of saying "The stars are shining tonight" should be ______.
A. the stars have been shining all the time B. the stars seen tonight will shine four yearslater
C. the stars were shining long ago but seen tonight D. the starlight seen today could beseen four years ago
參考答案與解析:
1. D 事實(shí)細(xì)節(jié)題。由第1段第1句可知。
2. B 推理判斷題。由第1段最后一句推出。
3. A 推理判斷題。由第2段的第2句(太陽(yáng)光到達(dá)地球需要8分鐘) 和第3句(月光到達(dá)地球僅需1.3秒) 可推出(太陽(yáng)光走過(guò)的距離明顯遠(yuǎn)于月光)。
4. C 推理判斷題。由最后一段的最后一句They wereshining four years ago, but their light has only just reached the earth可推出。
2014中考各科目復(fù)習(xí)資料匯總 | ||
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語(yǔ)文:閱讀 詩(shī)歌 名句 綜合 | 作文:素材 范文 技巧 中考范文 | 數(shù)學(xué):填空 壓軸 模擬 解題 |
英語(yǔ):單選 閱讀 易錯(cuò) 綜合 | 作文:句型 模板 技巧 熱點(diǎn)話題 | 政治:選擇 問(wèn)答 辨析 提綱 |
物理:易錯(cuò) 選擇 重點(diǎn) 公式 | 化學(xué):認(rèn)識(shí) 解讀 演練 熱點(diǎn)難點(diǎn) | 歷史:問(wèn)答 考點(diǎn) 材料 基礎(chǔ) |
生物:選擇 提綱 考點(diǎn) 資料 |
地理:基礎(chǔ) 提綱 問(wèn)答 熱點(diǎn)材料 | 2006--2012滿分作文匯總 |
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2013四川中考生物試題匯總 | 2013山東中考地理試題匯總 | 2013江蘇中考地理試題匯總 |
2013江蘇中考?xì)v史試題匯總 |
2013四川中考物理試題匯總 | 2013湖北中考政治試題匯總 |
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