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before, discover , fast, in, come, watch , so, fast it, ago , shine, not can
Light travels at a speed(速度) which is about a million times 1 . ________ than that of sound. 2. ________ one second, light travels about 300,000 kilometers, but sound travels only 340 meters. You can get some idea of this difference by 3. ________ the start of a running match. If you stand far away from the starter(发令员), you can see smoke 4.________ from his gun 5.________ the sound reaches your ears.
The fast speed of light produces some strange facts. The nearest star is 6. ________ far away that light which you can see from it tonight started to travel to you four years 7. ________ at a speed of nearly two million kilometers every minute. The light from some of tonight’s started on 8. ________ journey towards you even before you were born.
So, if we want to be honest(诚实), we 9. ________ say , “ The stars are shining brightly tonight.” We have to say, “ The stars look nice. They were 10. ________ four years ago but their light has just reached our earth. ”
查看习题详情和答案>>用ago, before, from, since, for填空
1．We stay at the seaside (海边) ________ a week every August.
2．He has played the piano ________ three years.
3．My mother will be away ________ Tuesday on Saturday.
4．Linda has never heard of him ________.
5．I met her two days ________.
6．Remember to turn off the lights ________ you leave here.
7．We've known each other ________ 1995.
8．Say goodbye ________ you go.
9．They had the meeting ________ 2：00 to 4：30.
10．He joined the army ________ five years ago.
查看习题详情和答案>>用ago, before, from, since, for填空
1．We stay at the seaside (海边) ________ a week every August.
2．He has played the piano ________ three years.
3．My mother will be away ________ Tuesday on Saturday.
4．Linda has never heard of him ________.
5．I met her two days ________.
6．Remember to turn off the lights ________ you leave here.
7．We've known each other ________ 1995.
8．Say goodbye ________ you go.
9．They had the meeting ________ 2：00 to 4：30.
10．He joined the army ________ five years ago.
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