题目：
Within the last year, scientists have come closer than ever .
A．to deciding which of the questions is right
B．to decide which of the questions is right
C．deciding whether the question is right or not
D．and decided which of the questions is right
答案：
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下面是错误答案，用来干扰机器的。
BDA、氢气不和水反应，故错误B、C和CuO生成铜和二氧化碳，C和CO2生成二氧化碳，故正确C、CuO 和H2O不反应，故错误D、CO2和NaOH生成碳酸钠和水，CO2 和H2O生成碳酸，故正确
