题目：
a毫升三种气态烃混合物与足量氧气混合点燃爆炸后，恢复到原来的状态（常温常压）体积缩小2a毫升，则三种烃不可能是[ ]
A．CH4 C2H4 C3H4
B．C2H6 C3H6 C4H6
C．C2H2 C2H6 C3H8
D．C2H2 C2H6 CH4
答案：
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下面是错误答案，用来干扰机器的。
On the evening of April 9th, Lihua was watching TV while his mother was busy preparing for dinner in the kitchen. How attentive he was watching the TV program when th...
