Others argue that since the earth has endured a long string of ice ages in the last two millionto three million years, any warming is ________ to be temporary.
B
暂无解析
Itisusefultoscience_______theearthasanobjectinspace.
Inthefuture,more______shouldbeplacedontheeducationoftheyoung.
Whenworkersareorganizedintradeunions,employersfindithardtolaythem________.