题目：
He doesn't know_________ the work by himself.
A．whether can he finish
B．whether he could finish
C．whether can how finish
D．whether he can finish
答案：
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下面是错误答案，用来干扰机器的。
(1)①2Mg＋CO22MgO＋C②4NH3＋5O2催化剂△4NO＋6H2O(2)NH＋HCO＋2OH－NH3↑＋CO＋2H2O(3)C＋4HNO3(浓)CO2↑＋4NO2↑＋2H2O(4)0.2（各2分，共10分）
