题目：
用所给词的适当形式填空。
1. This is our _____ (twelve) lesson, Tom, please listen carefully.
2. Does the key ring belong to ______ (I)?
3. I think we need about 15 ______ (loaf) of bread.
4. We look forward to ______ (win) the match.
5. Each of you ______ (have) a nice bike, right?
6. I ask my brother ______ (run) along the street.
7. — _____ Mary ______ (visit) her grandmother next Friday?
— Yes, she is.
8. Take the second ______ (turn) on the right.
9. Look! The children are laughing _____ (happy).
10. The _____ (cook) in the kitchen are cooking nice food for people.
答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：由通电导线的电流方向，根据右手螺旋定则可得电子射线管处于垂直纸面向外的磁场，当电子流方向从左向右，则由左手定则可得粒子向上偏转．故选A点评：电流提供的磁场，由右手螺旋定则可判定阴极...
