题目

阅读理解 Dear Mary, I’m sorry to tell you that I can’t go shopping with you today. I have a lot of work to do, so I need you to do some things for me. First, your brother is at Grandma’s house. Pick him up (接某人) before six in the afternoon, because he has a piano lesson at 6:30 pm.  After that, you need to do some shopping in the supermarket for your birthday party tomorrow. I need some fruit to make juice, and I also want to make a big cake. Remember to buy two kilos of chicken. That’s your favourite food. If you have any questions, give me a call.       三角形的三边a，b，c都是整数，且满足abc+bc+ca+ab+a+b+c=7，则此三角形的面积等于（　　） A、32B、24C、34D、22