【題目】Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000 km, but sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the Starter, you can See smoke come from his gun before the sound reaches your ears. This great speed of light produces some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light rays (光線) left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some cases the light from one of tonight’s stars started on its journey to you before you were born.

Thus, if we want to be honest, we cannot say “The stars are shinning tonight.” We have to say, “The stars look pretty. They were shining four years ago but their light has only just reached 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 meters away from a man who is firing a gun to start a race, you will find out that __________.

A. you can hear the sound before you see the smoke

B. the sound does not travel as fast as light

C. the sound will reach you before the man fires

D. sound travels about a million times faster than light

【3】Sunlight obviously (顯然的) __________ 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

【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 years later

C. the stars were shining long ago but seen tonight

D. the starlight seen today could be sera four years ago

【答案】

【1】D

【2】B

【3】A

【4】C

【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 were shining four years ago, but their light has only just reached the earth可推出。

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