题目

Statistics show that men have _____ as women do for every mile they drive．        A．serious accidents as twice many          B．twice as many serious accidents        C．twice serious accidents as many          D．serious accidents as many twice 答案：B 解析: 略在树→昆虫→喜鹊这条食物链中，如果大量捕杀喜鹊，最可能的后果是（ ）A．昆虫的数量减少B．昆虫的数量增多C．树不会受到任何影响D．树会长得更好