Life on Mars would be interesting and challenging(具有挑战性的).However,
it may take hundreds of years to make it true.So the most important thing we need to
do now is to protect our beautiful blue planet-the Earth!
()16.People would move to Mars because
A.flying to Mars would be fun
B.plants could grow better there
C.the Earth is crowded and polluted D.they want to challenge themselves
()17.What does the underlined word"it"in paragraph 2 refer to
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A.spacecrafts
B.the journey to Mars
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C.passengers
D.technology
()18.What would the flight to Mars be like by the year 2100
A.Slow and boring.
B.Fast and enjoyable.
C.Slow but comfortable.
D.Fast but uncomfortable.
()19.What can we learn from the passage
A.People would be busy with work on Mars.
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B.There would be enough water and air on Mars for people.
C.The writer thinks living on Mars would be full of challenges.
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D.Food on Mars would be more delicious than that on the Earth.
)20.What's the best title for the passage
A.Life on Mars
B.Food on Mars
C.Schools on Mars
D.Environment on the Earth
DThat future is almost here."I think it's going to happen in ten years...and
hopefully much,much faster,"said Sebastian Thrun in 2021.At that time,his young
company Kitty Hawk Corporation was working on developing a flying car known as
eVTOL,or Electronic Vertical Take-Off and Landing vehicle ()
2Flying to work or school sounds unbelievable.Not only is it fun to fly,but
"there would never be traffic again,because the sky is very,very large,"says Thrun.
He also thinks eVTOLs could be greener than common cars."We go much faster,we
go in a straight line,we fly on less energy,"he says.
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