题目

The police car signalled to us to ___________.A.pull on B.pull in C.pull through D.pull down 答案：【答案】B【解析】考查动词短语辨析。句意：警车向我们打手势叫我们靠边停车。A. pull on穿；戴；B. pull in停下；C. pull through渡过难关；D. pull down摧毁。根据句意故选B。下列实验能达到目的的是用酒精萃取溴水中的溴将硫酸铜溶液直接蒸干得到胆矾说明2NO2(g) N2O4（g）   △H<0实验室制备Fe(OH)2ABCD