单选题 It has been proved that cockroaches (蝉螂) ______ for several weeks even after their heads have been cut off.

【正确答案】 B
【答案解析】该句话的意思是，“已经证实，蟑螂甚至在头被砍掉以后，仍能活几个星期”。根据句意，表示能够存活的只有B项。另外，该题题干的主语从句中缺少谓语，故可排除C，D选项。