Ifmankindistryingtofindnewplacesinspacetoliveandgetnewresources,itisfine.
A.the; theB./; /C.a; theD.the; a在线课程B
解析:
考察冠词。第一空mankind意为人类,泛指,不需要the,第二空意为太空,space意为太空的时候,前面用零冠词,句意为,如果人类在努力寻找太空里居住的空间和寻找新的资源的话,那没关系。
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