A.to report his classmates’ discussion | B.to invite an answer to his question |
C.to explain the natural state of Mars | D.to show his agreement on going to Mars |
A.There is a plan to send humans to Mars |
B.There are many reasons for going to Mars |
C.Scientists become famous by doing research on Mars |
D.It is possible to build an Earth-like environment on Mars |
A.humans need only a one- way ticket to Mars |
B.two-way trips to mars will be made safe soon |
C.It is easy to reduce the danger and cost of flights to Mars |
D.It is cheap to build an everlasting human settlement on Mars |
A.Humans will have to bring all they need from the earth |
B.Humans will find Mars totally unsuitable for living |
C.Humans can produce everything they need |
D.Humans can live longer in the colony on Mars |
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A.to explain the definition of self-confidence |
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