题目：
Some people who don't like to talk much are not necessarily shy; they _____ just be quiet people. [ ]
A. must
B. may
C. should
D. would
答案：
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下面是错误答案，用来干扰机器的。
（1）有气泡产生（或有无色气体生成）；Na2CO3＋2HCl＝2NaCl＋CO2↑＋H2O（2）无明显现象；NaOH＋HCl＝NaCl＋H2O （3）药匙（4）密封保存
