A device that stops drivers form falling asleep at the wheel is about to undergo testing at Department of Transport laboratories and could go on sale within 12 months. The sy
Shanghai Students’ Post ______ a great help in my English learning since three years ago. A) will be B) was
北方地区的典型植被是 ( ) A、亚热带常绿硬叶林 B、亚热带常绿阔叶林 C、温带落叶阔叶林 D、热带雨林
图2为某湖泊水位示意图,实线表示正常水位线,虚线表示某时刻水位线。 6.导致图中湖泊某时刻水位线相对于正常水位线差异的原因可能是 A
When I was a little boy, I lived in a small fishing village. The visit to the village reminded me of _______ of my childhood. A. views B. scenes B. scenery
在“噬菌体侵染细菌的实验”中,如果对35S标记的噬菌体一组(甲组)不进行搅拌、32P标记的噬菌体一组(乙组)保温时间过长,其结果是
下列词语中没有错别字的一组是 ( ) A、撕杀 气慨 追溯 迫不急待 B、琐碎 吝啬 提纲
已知a>0,且a≠1,若ab>1,则( ) A.ab>b B.ab<b C.a>b D.a<b