拥塞会导致下面哪种效果?()
更新时间:2024-11-01 23:35:26 A、低可靠性和低流量E
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heteachertoldthemsincelight________(travel)fasterthansound,lightning________(appear)togobeforethunder.
（）
则下列结论正确的是（）
EachyearintheUnitedStates,manyblackteenagers_______ofschool,eitherbecausetheycannotkeepuportheyhavetoworktosupporttheirfamily.
Theproblem________whenthestudentsrefusedtodotheirhomework.
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