题目

A. 根据句意或中英文提示，写出单词的正确形式，每空一词。(8 分)1. He is my ________ (双胞胎) sister, Kate.2. Lucy is going to the ____________（博物馆）this winter holiday.3. Kitty is small and she loves to  ____________（跳舞）.4.There are two ___________ (图书馆) in my school.5. Tom is a ________ (有礼貌)boy. He always says hello to his teachers. 6.Would you like to be a m__________ of the Reading Club?—Of course..7. He enjoys c_____ with his friends on the Internet .8.Listen to me and a_____________ my questions.B. 用所给词的适当形式填为了测量牛奶的密度：给你天平（含砝码）、量筒、烧杯，请你写出测量步骤和密度大小的表达式．步骤：①在烧杯中倒入适量的牛奶，用天平测出牛奶和烧杯的总质量m1；②将烧杯中部分牛奶倒入量筒，读出量筒中牛奶的体积V；③用天平测出烧杯和剩余牛奶的质量m2．①在烧杯中倒入适量的牛奶，用天平测出牛奶和烧杯的总质量m1；②将烧杯中部分牛奶倒入量筒，读出量筒中牛奶的体积V；③用天平测出烧杯和剩余牛奶的质量m2．；表达式：m1-m2Vm1-m2V．