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
第2题
丹佛发育筛查量表主要用于
A、<1岁
B、<2岁
C、<3岁
D、<4岁
E、<6岁
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