We can conclude from the passage that______.
A.while pushing asteroids off course nuclear weapons would destroy the world
B.asteroids racing across the night sky are likely to hilt Earth in the near future
C.the worry about asteroids can be left to future generations since it is unlikely to happen in our lifetime
D.workable solutions still have to be found to prevent a collision of asteroids with Earth
第7题
A.有关物质
B.其他甾体
C.硒
D.铁和铜
E.生育酚 以下药物中需检查的特殊杂质是
维生素CE.
第8题
A.有关物质
B.其他甾体
C.硒
D.铁和铜
E.生育酚 以下药物中需检查的特殊杂质是
维生素CE.
第9题
维生素C
A.有关物质
B.其他甾体
C.硒
D.铁和铜
E.生育酚 以下药物中需检查的特殊杂质是
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