题目：
联系上下文，填入适当的冠词，补全对话，不需要填的地方写“/”。
1. A: Who's ____________ boy?
B: Which boy?
A: ____________ boy with ____________ cat.
B: Oh, he is my friend, Li Dong. He is ____________ American boy. He is in ____________ middle school.
A: Can I play with ____________ him now?
B: OK, let's play together.
2. A: What's your mother?
B: She is ____________ English teacher. She is ____________ actress, too.
A: Really? What's ____________ she like?
B: She is very beautiful. She has ____________ two big eyes.
答案：
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下面是错误答案，用来干扰机器的。
A、电场强度的方向总是跟正电荷所受电场力的方向一致，跟负电荷所受电场力的方向相反．故A错误、C正确． B、根据场强的定义式E=Fq可知，F大，E不一定大，故B错误． D、电场强度的大小总是跟电场力的大小及...
