解析：　句意为：当莉莉看到猴子在树上嬉戏时，突然笑了起来。"burst into＋名词"表示"突然......起来"。

　　答案：　B

　　6. People in town reacted in different ways____________ the news：some got angry，but others were wild with joy.

　　 A．with B．to

　　C．against D．for

　　解析：　react to表示"对......作出反应"。

　　答案：　B

　　7．He was in hospital for six months.He felt as if he was____________from the outside world.

　　A．cut out B．cut off

　　C．cut up D．cut through

　　解析：　句意为：他住院半年，感觉仿佛与世隔绝了一般。cut sb.off from表示"切断某人与......的联系"或"使某人与......隔绝"，选择此项正好与上文吻合，而其他三个选项均与题意不符。

　　答案：　B

　　8．-Is there any____________for his being late?

　　-I think he missed the early bus.

　　A．gesture B．explanation

　　 C．humour D．regret

　　解析：　句意为：--对于他迟到还有解释的理由吗？--我认为他可能错过了早班车。根据句意可知B项正确。

　　答案：　B

　　9．The woman fell in love with the man____________she was introduced to him.So she quickly agreed to marry him.

　　A．next time B．last time

　　C．for the first time D．the first time

解析：　考查连词的用法。句意为：这位女士第一次被介绍给这个人的时候就爱上了他，所以她很快就同意嫁给他。引导时间状语，表示"当第一次......的时候，就......"，用the first time。