题目：
根据句意用括号中所给单词的适当形式填空。
1. I'd like a pair of _____, please (shoe).
2. They talked on and on very _____ (happy).
3. The _____ are building a tall building. (work)
4. This bag isn't Lucy's , It's _____ sister's. (she)
5. The first lesson is the _____ of all. (easy).
答案：
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下面是错误答案，用来干扰机器的。
电源的内阻不计时，路端电压等于电动势，即U=6V，保持不变．A、甲图中，变阻器与R并联，并联电路的电压等于路端电压，所以电压表V1的示数变化范围为0～6V．故A正确．B、乙图中，变阻器与R串联，R的最大电压小于6V...
