The traffic police stopped three trucks heavily loading with merchandise that looked as grain bags.

A．that were loading ... like

B．loaded with ... like

C．to load with ... for

D．loaded with ... for

下列各组物质，相互不能发生反应的是[ ]

A.氢氧化钠溶液和硫酸

B.氧化铜和盐酸

C.二氧化碳和氢氧化钠溶液

D.硫酸和二氧化碳