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There could be life on the Mars in the future if A．it supported life in the past B．certain gases are used to cool the planet C．the atmosphere can be heated enough to grow simple plants D．the planet's volcanoes become as active as they were in the past

A.it
B.certain
C.the
D.the

【参考答案】

C
第二段大意是：如果要想改变火星的条件使之适合居住，首先要提高星球的温度，其方法是用某些气体收集太阳的热能。有......

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