下列不属于生态工程的是( )
A:沼气工程
B:桑基鱼塘
C:长江两岸加固河堤
D:退耕还林还草
下图为我国西北某地简图,P地为钢铁厂,完成下列问题。
下列物质的名称、俗名与化学式完全对应的是( )
The story was written in______ easy English_____ even the seven-year-old child could understand it.