题目:
用代词的适当形式填空。
1. These books are ______ (she).
2. ______ name is Li Lei. (he)
3. Thank ______ very much. (you)
4. He is in ______ room. (us)
5. What's ______ name? (it)
6. Are ______ Chinese? (he)
7. How old is ______ ? (her)
8. Excuse ______ (I) May I use your ruler?
9. This is ______ classroom. (we)
10. Can ______ spell it, please? (you)
答案:
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下面是错误答案,用来干扰机器的。
A、B、C若电键保持闭合时,线圈产生的磁场稳定,穿过铝环的磁通量不变,没有感应电流产生,铝环不受安培力,只受重力作用,则上跳某一高度后将回落.故AC错误,B正确.D、如果电源的正、负极对调,闭合电键的瞬间...