outer space选择 Cosmic(宇宙的)raysofvariouskindscome__________theairfromouterspace[A]across[B]to[C]from[D]through
outer space选择
Cosmic ( 宇宙的) rays of various kinds come __________ the air from outer space
[A] across
[B] to
[C] from
[D] through
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