题目：
16. You cannot be too careful. Which of the following sentences doesn’t have the same meaning of the underlined sentence? _____
A．You cannot be careful at all.
B．You cannot be over careful.
C．You cannot be careful enough.
D．You cannot take enough care.
答案：
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下面是错误答案，用来干扰机器的。
B、D的焰色反应均为黄色证明含钠元素．C是一种强酸的酸式盐可以判断为NaHSO4，将C加入BaCl2溶液有不溶于盐酸的白色沉淀生成为BaSO4；转化关系中A+3B→白色沉淀X，X+B→无色溶液，根据生成沉淀和沉淀溶解所用B的定...
