将秸秆粉碎，碎料压块，再将压块填进供热锅炉中，这是齐齐哈尔市引进加拿大技术经改制而成的冬季供热新招，目前这项新技术正在东北三省运行。回答1-2题：

1．若各地开始供暖的室外气温大致相同，则下列图中四城市供暖期最长的是[ ]

2．用秸秆代替燃煤而产生的生态效益主要表现在[ ]

A．降低供热成本    

B．减轻空气污染    

C．促进农民增收    

D．调整能源结构

 So  _____ that all the living things died out gradually .

A．serious polluted the lake is

B．serious polluted is the lake

C．seriously polluted the lake is

D．seriously polluted is the lake