地球是生命的摇篮,分析地球的宇宙环境和地理环境的特点与生命物质存在条件的关系,组合正确的是: ①地球磁场 a.地球表面存在大气层 ②地球的质量与体积 b.削弱到达地面的紫外线 ③地球与太阳的距离 c.使水经常能处于液体状态 ④地球大气中的臭氧层 d.导致高纬度地区多出现“极光” A ①-b B ②-a C ③-c D ④-d
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【单选题】As a reliable travel agency, we really do try to describe our centers and accommodation as realistically as possible. All our Super Centers and Main Centers have been extensively investigated during t...
【单选题】As a reliable travel agency, we really do try to describe our centers and accommodation as realistically as possible. All our Super Centers and Main Centers have been extensively investigated during t...
A.
helpful fault-finding by customers
B.
attractive description of the centers in every brochure
【单选题】As a reliable travel agency, we really do try to describe our centers and accommodation as realistically as possible. All our Super Centers and Main Centers have been extensively investigated during t...