使用酒精灯时，错误的操作是

A．用火柴点燃酒精灯

B．用燃着的酒精灯去点燃另一盏酒精灯

C．用酒精灯外焰给物质加热

D．有腐蚀性的药品不能直接放在天平的托盘上称重

The transportation has improved a lot in that province, with two new roads ____ last year

A．constructing

B．to construct

C．constructed

D．construct