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【单选题】At the first sight the planet Mars(火星)does not appear very welcome to any kind of life．It has very little oxygen and water, the temperature at night is below -50°C and winds of 100 miles per hour caus...
A.
there is no life there now
B.
there is a large amount of water at the poles
C.
the Mars may be able to support life in the future
D.
conditions may have been similar to those on the Earth
【单选题】Humans may not have landed on Mars (火星) just yet, but that isnt stopping a European company from devising a plan to send four people to the Red Planet within the next few years．(78)This project, calle...
A.
seven
B.
eight
C.
ten
D.
six