按运输工具分，材料运输的方式有铁路运输、（）、航空运输非机动运输。
A、公路运输
B、水路运输
C、直达运输
D、管道运输
参考答案：A, B, D
---Thank God! The accident was avoided after all.
---That was lucky, but ten inches nearer and the two cars ________. [ ]
A. were destroyed
B. would be destroyed
C. would have been destroyed
D. had been destroyed
下列各项的变化中，放出热量的是（ ）
①钠与盐酸反应 ②生石灰与水反应 ③浓硫酸滴入水中 ④氢氧化钠溶于水
A．①③
B．③
C．①②③④
D．①②③
