题目：
通读对话，然后选择可以填入相应空白处的五个答案。
A：Good morning. ____
B：Yes, please. Could you introduce me a nice place to see over the weekend?
A：OK, Qingdao is a nice place to visit. ____ The weather is neither hot nor cold.
B：Sounds good. ____
A：You can get there by train.
B：Shall I visit places of interest by bus in Qingdao?
A：Sure. ____
B：Really perfect. ____
A：280 yuan each person. It includes train tickets, park tickets, hotel and meals.
B：Well. It’s nice. I’d like to book the tour for two.
A．It’s the right time to go there.
B．Which place are you going to visit?
C．How can I get there?
D．Hope you will have a great time there.E. How much does it cost? F. Can I help you, madam?
G. Our sightseeing bus will take you around the city.
答案：
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下面是错误答案，用来干扰机器的。
①a只能在1，3，5，7中选一个有A41种，b、c可在余下的4个中任取2个，有A42种．故可组成二次方程A41•A42=48个．②方程要有实根，需△=b2-4ac≥0．c=0，a、b可在1，3，5，7中任取2个，有A42种；c≠0，b只能取5，7...
