问题
完形填空
用括号里的词的适当形式完成句子。
小题1:Mr Green has four ___________. (child)
小题2:I want to buy five ___________ for supper. (tomato)
小题3: Billy has a box of ___________. He is going to share them with Sandy and Tom. (chocolate).
小题4:Don’t throw these___________ on the floor. (knifer)
小题5:We have eight ___________ every weekday. (class)
答案
小题1:children
小题1:tomatoes
小题1:chocolates
小题1:paper
小题1:classes
电势差只与这两点的场强有关