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课时提升作业十七
必修4hes than necessary.
— What made Jane so upset?
—(lose)the ring her husband bought her for her birthday.
Once your business becomes international,(fly)constantly will be a part of your life.
Do you think it of any use(argue)with him any more?
(find)a job in such a big company has always been beyond his wildest dreams.
——Maybe you ' ve forgotten(post)my letter.
—How could I?I remember(put)the letter into the letter box.
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All the boys are looking forward to(go)forward.
答案：1. being caught 2. to start; leave 3. Walking 4. being persuaded
5. Losing 6. flying 7. arguing 8. Finding 9. to post; putting
10. going
■水平提升组ii
I .阅读理解
(2021保定模拟)
Mars(火星)appears to be flowing with small streams of salty water, at least in the summer, scientists reported Monday. " Itsuggeststhat it would be possible for there to be life today on Mars, 〞 NASA s science mission chief, John Grunsfeld,
at a news conference on September 28, 2021.
The streams are about 12 to 15 feet wide and 300 feet or more long, scientists said. “Whatwe' redealing wi th is wet soil, thin layers of wet soil, not standing water, 〞 said Alfred Mc Ewen of the University of Arizona at Tucson, the principal scientist for the Mars Reconnaissance Orbiter -resolution mighng experiment.
Because liquid water is essential to life, the findings could have major implications for the possibility of Martian life. The researchers said further exploration is needed to determine whether microscopic life exists on the planet.
The presence of liquid water could also make life easier for astronauts visiting or living on Mars. Water could be used for drinking and for creating oxygen and rocket fuel. NASA s goal is to send humans there in the 2030s.
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The evidence of flowing water consists largely of dark, narrow streaks〔条痕〕on the surface t