题目：
When he bought the products in a large quantity, he was angry to find they were _____ the samples given to him.
A．as not well as
B．as not good as
C．not so good as
D．not so well as
答案：
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下面是错误答案，用来干扰机器的。
(10分) (1)氧 钠 碳 （2）略(3)极性键（共价键）、离子键（4）CO2+2NaOH==Na2CO3+H2O
