18. A) Its chemical elements must be studied.
B) Its temperature must be lowered.
C) Big spaceships must be built.
D) Its atmosphere must be changed.
19. A) It influences the surface temperature of Mars.
B) It protects living beings from harmful rays.
C) It keeps a planet from overheating.
D) It is the main component of the air people breathe.
20. A) Man will probably be able to live there in 200 years.
B) Scientists are rather pessimistic about it.
C) Man will probably be able to live there in 100,000 years time.
D) Scientists are optimistic about overcoming the difficulties soon.
答案:
1.C 2.D 3.B 4.D 5.C 6.B 7.A 8.C 9.A 10.C 11.C 12.D 13.B 14.D 15.B 16.A 17.A 18.D 19.D 20.C
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