下列说法正确的是（ ）
A．植物的光合作用有益于生态环境
B．废水直接排入江河有利于鱼类生长
C．凡是“绿色食品”均不含化学物质
D．生活污水直接排放到自然界，有利于提高土壤的肥力
A、光合作用消耗二氧化碳释放氧气，有益与生态环境，故此选项正确．
B、废水直接排入江河对水质有污染作用，不利于鱼类生长，故此选项错误．
C、任何物质都是有化学成分组成，故此选项错误．
D、生活污水对环境能造成污染的物质有很多，故此选项错误．
故选A
阅读下列短文，从文后各题所给的四个选项中选出一个最佳答案 。 When I was in primary school, I had a big argument with a boy in my class. I can’t ____ what it was about, but I have never forgotten the ____ I learned that day. I was sure that I was right and he was wrong. ____ , he strongly believed that I was wrong and he was right. The teacher decided to teach us a lesson. She _____ a good idea. She brought both of us to the front of the class and placed him on one side of her grey desk and me on ____. In the middle of the desk was a large, round object. It was ____ for me to see that it was black. She asked the boy what color the object was. “_____” he answered in a loud voice. I couldn’t ____ that the object was white, considering that it was certainly black! One more argument started between the boy and me, this time ____ the color of the object. The teacher told me to go stand where the boy was standing and told him to come stand where I had been. We changed ____, and then she asked me what the color of the object was. I ____ answer, “White.” It was then that I knew what was wrong. It was an object with two ____ colored sides, and from his side it was white. ____ from my side was it black. My teacher taught me a very improtant lesson that day: You must ____ in other person’s position （位置）and look at the ____ through their eyes in order to truly understand their ideas.
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