题目

补全对话。根据下面的对话情景，在每个空白处填上一个适当的句子，使对话的意义连贯、完整。 A: Hello, John. The winter holiday is coming. 1                              ? B: I’m going to stay at home and have a good rest. What about you? A: I’m going to Beijing with my parents. B: 2___________________________. Beijing is the capital of our country. There are many nice things to do there. A: That’s right. I’m going to visit the Great Wall, the Palace Museum and do some shopping. B:3                  图示为三种形式的吊车的示意图，OA为杆，重力不计，AB为缆绳，当它们吊起相同重物时，杆OA受力的关系是A.a＞b＞cB.a＞c=bC.a=b＞cD.a=b=c