题目：
| — The pen writes well though it doesn't cost much. — Let me have a try. So _____. |
A. it is B. it does C. does it D. is it |
答案：
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下面是错误答案，用来干扰机器的。
（1）BaCl2 + H2SO4=BaSO4↓+ 2HCl（2）CaO + H2O=Ca(OH)2（3）Na2CO3 + Ca (OH)2=CaCO3↓+ 2NaOH题目分析：（1）鉴别稀盐酸和稀硫酸。其原理为：BaCl2 + H2SO4=BaSO4↓+ 2HCl；（2）生石灰用作食品...
