问题
选择题
小强要探究贝壳的主要成分，他设计了如图所示的实验。下列关于此实验的现象描述错误的是
A．有气泡产生
B．表面皿内壁有白色物质出现
C．贝壳逐渐溶解
D．烧杯中溶液的质量不变
答案
答案：D
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小强要探究贝壳的主要成分，他设计了如图所示的实验。下列关于此实验的现象描述错误的是
A．有气泡产生
B．表面皿内壁有白色物质出现
C．贝壳逐渐溶解
D．烧杯中溶液的质量不变
答案：D
用方框内所给单词的适当形式填空。
Some of __2__ friends walk (步行, 走) to school. Tom and Amy __3__ home at four o'clock in the afternoon. They do their __4__ before (在......以前) dinner, and they play computer games __5__ dinner. They usually go to __6__ early in the evening. Tom and Amy have __7__ meals (饭) a day: breakfast, lunch and dinner. They have breakfast __8__ home. On school days, they have lunch at school. They usually __9__ dinner at home. Their father comes home from __10__ at six and their mother cooks dinner at seven. |