A:are used to; are used to
B:be used to; are used to
C:are use to; used to
D:used to; are used to
Do you like jelly?
①甲处的噬菌体一定含有放射性
②乙处的噬菌休一定不含放射性
③图2增设一组35S标记的噬菌体作对照,可证明遗传物质是DNA,而不能证明蛋白质是不是遗传物质
④若培养到第2代,甲处DNA分子两条链都有放射性的噬菌体比例数为100%