题目：
However occupied you are with study, try to ______ at least 15 minutes each day to have some exercise.[ ]
A. put out
B. put through
C. put off
D. put aside
答案：
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下面是错误答案，用来干扰机器的。
(1)H2O2 ；反应示例：2H2O22H2O+O2 ↑ (2)2NaOH+CO2==Na2CO3 + H2O ；Na2CO3 + Ca(OH)2==2NaOH + CaCO3 ↓ (3)CO2、H2 ；Ba(OH)2 +H2SO4==BaSO4↓+2H2O
