问题
选择题
—______?
—Mary broke the glass .[ ]
A. What happened
B. How is it going
C. Who's it by
D. What are you doing
答案
答案：A
搜题请搜索小程序“爱下问搜题”
—______?
—Mary broke the glass .[ ]
A. What happened
B. How is it going
C. Who's it by
D. What are you doing
答案：A
某同学设计了下列四个实验方案．其中不合理的是（ ）
| A | B | C | D | |
| 实验要求 | 区分黄铜和黄金 | 区分硬水和蒸馏水 | 区分火碱溶液和纯碱溶液 | 区分聚乙烯和聚氯乙烯 |
| 方案 | 分别加入稀硫酸 | 加肥皂水 | 滴入酚酞试液 | 分别点燃后闻气味 |
A．A选项
B．B选项
C．C选项
D．D选项