下列哪些全球性的大气污染直接影响整个生物圈的机制和平衡?()
A.酸雨
B.气候变异
C.臭氧层的破坏
D.热带雨林的减少
E.温室效应
A.酸雨
B.气候变异
C.臭氧层的破坏
D.热带雨林的减少
E.温室效应
第1题
第2题
A.at the beginning of every watch
B.at the beginning of the first watch every day
C.at the completion of every watch
D.at noon every day
第3题
第4题
The two scientists were quarrelling at the beginning of the story, because ______.
A.the Japanese watch was better
B.the German watch was better
C.each of them thought his own watch was better than the other's
D.both the watches were wrong
第5题
A.it has to be modified over time to remain effective.
B.for all its current profits, it will fade in the long run.
C.banners are beginning to lose their advertising efficiency.
D.Internet advertising methods will continue to decrease sales.
第6题
A.it has to be modified over time to remain effective.
B.for all its current profits, it will fade in the long run.
C.banners are beginning to lose their advertising efficiency.
D.Internet advertising methods will continue to decrease sales.
第7题
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!