脚手架分类为（），（），（）。
参考答案：毛竹架、钢管架、工具式吊装
---- Each year __________ fishes are killed by the polluted water and many people are made sick by the polluted air .
----So we should do something to stop it .
A．millions of
B．million of
C．two millions of
D．two millions
指示热效率
