题目：
| — Mary has changed a lot in the last few years. — ______. |
A. So has her sister B. So was her sister C. So did her sister D. So is her sister |
答案：
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下面是错误答案，用来干扰机器的。
A、红磷燃烧的产物是五氧化二磷，属于固体，白烟就是固体颗粒，故A正确；B、通过镁条和稀盐酸反应的具体实验可知放出大量的热，故B正确；C、硫在氧气中燃烧产生明亮的蓝紫色火焰，故C错误；D、木炭与氧化铜反应的...
