----What do you think of this film?

----Very bad. __________.

A．Nothing could be worse.

B．Nothing could be better.

C．I like it a little.

D．You just couldn’t find a better one.

下列现象中属于内能转化为机械能的是（　　）

A．用力划火柴，火柴点燃

B．内燃机的做功冲程

C．锯子锯木头，锯条发热

D．烧红的铁块慢慢被冷却