题目

按要求完成句子。 A. What size do you want? B. It's fifty yuan. C. Can I help you? D. Yes, we do.E. but where is the store?Amy: Let's go to the store.Ken: OK, .Amy: Turn left. Then walk straight. It's on the right.Ken: Ok. Let's go.Assistant: .Amy: Yes, I want a dress. Do you have any dresses?Assistant: .Amy: How much is it?Assistant: .Amy: Oh, it's cheap.Assistant: .Amy: Medium. Oh, it fits me. I'll take it.如图所示，当闭合开关S，且将滑动变阻器的滑片P向右滑动时，图中的电磁铁（ ）A．a端是N极，磁性增强B．b端是N极，磁性增强C．a端是S极，磁性减弱D．b端是S极，磁性减弱