单项选择题

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A.Inviting him to dinner.
B.Inviting him to a party.
C.Asking him for money.
D.Asking him to talk to his girlfriend.
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单项选择题
What is the main goal of sending human missions to Mars
A.To find out if life ever existed there.
B.To see if humans could survive there.
C.To prove the feasibility of large-scale space ventures.
D.To show the leading role of science in space exploration.
单项选择题
A.A new fuel for buses.B.The causes of air pollution.C.A way to improve fuel efficiency in buses.D.Careers in environmental engineering.
A.A new fuel for buses.
B.The causes of air pollution.
C.A way to improve fuel efficiency in buses.
D.Careers in environmental engineering.
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