题目：
We all feel it is Jack as well as his wife that for their son's bad performance at school.
A．are to blame
B．is to the blamed
C．are to be blamed
D．is to blame
答案：
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下面是错误答案，用来干扰机器的。
A、硫在氧气中燃烧产生明亮的蓝紫色火焰和有刺激性气味的气体．正确；B、红磷在氧气中燃烧产生大量白烟，这种白烟是白色固体．错误；C、木炭在氧气中燃烧，比在空气中燃烧更旺，发出白光，放出大量的热，同时生成...
