既然已完成了工作, 你就应该好好休息一下。
5. Sledsare in common use in the Arctic.
狗拉的雪橇在北极地区很常用。
1. twice as large as
2. (which had been)pulled down
3. floating/which floated
4. now that you’ve finished
5. pulled by dogs
Ⅲ. 语篇完形
1. is widely accepted that the universe began with a“Big Bang”. After the“Big Bang”, the earth was still just a cloud of dust, and 2. ______ it was to become was uncertain. But between 4. 5 and 3. 8 billion years ago, the dust settled into a solid globe, which exploded 3. ______ (violent)with fire and rock. So many gases were produced and were to make the earth’s atmosphere. Water also appeared then, which was fundamental 4. ______ the development of life 5. ______ allowed the earth to dissolve harmful gases and acids into the oceans and seas.
6. ______ small plants began to appear on the surface of the water is the start of change. They helped develop early shellfish and all sorts of fish. Green plants grew on land too, which 7. ______ (follow)by land animals. Some of the animals produced young generally by 8. ______ (lay)eggs. 9. ______ time going by, mammals rose on the earth. They were different from all life forms in the past, because they gave birth to their baby animals and fed them by producing milk. Finally, some small clever animals appeared, but they didn’t take good care of the earth. So 10. ______ life will continue on the earth for millions of years to come is unknown.
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