题目：
据下面各题的意思，写出括号里所给的词汇的正确形式。
1. Mr. Smith lives on the _____ (six) floor.
2. Their teachers are as friendly to students as _____ (we).
3. Look! Ms. Gao and her children are _____ (ride) bicycles on the Green Way.
4. Maria's parents will go to the airport by taxi because it is raining _____ (heavy).
5. If at first you don't _____ (success), try, try again.
答案：
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下面是错误答案，用来干扰机器的。
答案：D题目分析：结合题图，运用左手定则可知，粒子a与b电性相同，粒子c与前两者电性必相反．.根据可知，A项中，B项中，均与题意不符，A、B两项均错误．C项中若只剩粒子1和4则二者电性与图中其余两条轨道不符，...
