[解析] “How do you do?”即“你好!”是两人初次见面的问候语。对这句话的恰当回应通常是“How do you do?”，故选C。
【正确答案】
A
【答案解析】[听力原文] Do you think Bob will help us?
[解析] “Do you think Bob will help us?”即“你认为的鲍勃会帮我们吗?”，“Do you think．．．?”这一句式是询问对方“你认为……吗?”。A选项“Sure!”(当然!)是对这一询问的恰当回应，故选A。
【正确答案】
C
【答案解析】[听力原文] I'm sorry，there is no room left， could you share it with others?
[解析] “I'm sorry，there is no room left，could you share it with others?”即“很抱歉，已经没有房间了，您可以与别人同住吗?”，“Could you．．．?”这一句式不表示过去，而是委婉地建议他人“您可以……吗?”。C选项“It doesn't matter．”(没关系。)是对这一建议的恰当回答，故选C。
【正确答案】
B
【答案解析】[听力原文] What do you like to do in your spare time?
[解析] “What do you like to do in your spare time?”即“你业余时间喜欢做什么?”。B选项“Play basketball．”(打篮球。)是对这一询问的恰当回答，故选B。
【正确答案】
B
【答案解析】[听力原文] What time is the next train to Boston?
[解析] “What time is the next train to Boston?”即“下一趟去波士顿的火车是什么时候?”，“What time is．．．?”用于询问“……是什么时间?”。B选项“It's 9:30．”(9点半)是对这一询问的恰当回答，故选B。