9. It still puzzles the science world why some mammals produce their young by________ (lay) eggs and hatching while others by______ (give) birth to young babies.
9. laying;giving
題目來(lái)源：全品作業(yè)本高中英語(yǔ)必修3新課標(biāo)人教版 > Period One Reading ， Comprehending & Learning about Language
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15. It is a common practice in China that the bride at the wedding be dressed in red to ensure good luck.
A. can B. may
C. must D. would
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4. [2013 •遼寧卷]We are confident that the environment by our further efforts to reduce pollution.
A. had been improved
B. will be improved
C. is improved
D. was improved
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5. From his_________ (puzzle) look,I knew that the questions were_______ (puzzle).
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8. Take some time to your successes and failures.
A. account of B. reflect on
C. work out D. call up
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語(yǔ)法填空「20巧.吉林省吉林市第一中學(xué)高一下學(xué)期第二次質(zhì)檢]
閱讀下面材料，在空白處填人適當(dāng)?shù)膬?nèi)容（1個(gè)單詞）或括號(hào)內(nèi)單詞的正確形式。
How life began on the earth
How the earth came into existence and how life began on the earth, no one knows 1.________ (exact) ， as it happened so long ago. However, according to a widely 2. ________ (accept) theory, the universe began with a "Big Bang" that threw matter 3. _________ all directions. After that, atoms began to form and combine to create stars and other bodies. Between 4. 5 and 3. 8 billion years ago, the earth became 4. ____ violent that it exploded loudly with fire and rock, producing water vapour and other gases.
When the earth cooled down, water appeared on its surface. Water had also appeared on other planets like Mars but, 5. ______ (like) the earth, it had disappeared later. It was not immediately obvious 6. ______ water was to be fundamental to the 7. _______ (develop) of life. What many scientists believe is that the continued presence of water allowed the earth 8. ______ (dissolve) harmful gases and acids into the oceans and seas. This produced a chain reaction, which made 9. ________ possible for life to develop.
Millions of years later, life began to develop on the earth, from simple forms to advance ones, from oceans to land, from plants to animals. Finally about 2. 6 million years ago some clever animals appeared. 10.______ they have, in their turn, become the most important animals on the planet.
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10. They could have attended the awarding ceremony,
but their flight due to the bad weather.
A. was delayed B. had been delayed
C. has delayed D. was delaying
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16. ―Its my treat today. Is there any particular meal you would like to have?
―________ you choose is all right with me.
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5. It is possible to_____ _ (繁殖)these bacteria in the laboratory.
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