penetrate the 7选择 makesourenvironmentstolerableandsomeultravioletrays(紫外线)penetratethe____[A]environment[B]space[C]atmosphere[D]earth
penetrate the 7选择
makes our environments tolerable and some ultraviolet rays (紫外线) penetrate the ____
[A] environment
[B] space
[C] atmosphere
[D] earth
相关考题：
7、7、在进行快速抓拍时，通常选择M档。