煤气的三大危害是什么？
参考答案：
燃烧、爆炸、中毒。
He speaks English ________ an American, so we all think he stays in America for many years.
A．as good as
B．worse than
C．as badly as
D．as well as
该病人的治疗首先考虑
A．解痉止痛
B．利胆驱虫
C．抗感染
D．继续观察
E．立即手术
