假设甲乙两个国家结成关税同盟，则甲乙两个国家的关境______。
A．大于国境 B．小于国境 C．等于国境 D．没有关系
参考答案：A
如图为“研究电磁感应现象”的实验装置。
(1)将图中所缺的导线补接完整。
(2)如果在闭合电键时发现灵敏电流计的指针向右偏了一下，那么合上电键后可能现的情况有：
A．将原线圈迅速插入副线圈时，灵敏电流计指针将____________。
B．原线圈插入副线圈后，将滑动变阻器触头迅速向左拉时，灵敏电流计指针___________。
用恰当的词语填空，完成对话。每空一词。
(An Old lady is coughing. She looks weak.)
Kangkang: Good morning, Granny. What's wrong with you?
Granny: Oh, boy. It's difficult for me to 1______.
Kangkang: How 2______ have you been like this?
Granny: I've been like this 3______ last week.
Kangkang: Have you seen a doctor?
Granny: No, I haven't. The chemical factory produces terrible gas. The bad air makes my chest 4______.
Kangkang: That's too bad. Pollution causes too many problems. I think I should write to the newspaper
about these problems. But now you'd 5______ see a doctor.
