No sooner _____ the boy fall into the pond than he ____ to his feet and went to the rescue.

A．he had seen… jumped

B．had he seen… jumped

C．has he seen… is jumped

D．did he see… had jumped

两支完全相同的试管内分别装有质量相等的水和酒精，一起悬放在装水的烧杯中，当用酒精灯给烧杯长时间加热时 　[     ]

A． 试管中的酒精先沸腾，水后沸腾

B． 试管中的酒精会沸腾，水不沸腾　

C． 试管中的酒精和水都不会沸腾

D． 试管中的酒精和水同时沸腾