题干

Ⅰ.雾霾造成的隐患成了社会关注度最高的民生事件之一.我国正在努力推进大气污染和防治工作.

(1)煤的不完全燃烧是空气污染的重要,针对此现象要求改用天然气或对煤炭进行粉碎后燃烧,煤炭粉碎后燃烧的科学原理是____ .

(2)雾霾天气时建议佩戴专用口罩出行,活性炭口罩是专用口罩的一种,其中活性炭具有____性.

(3)新能源的使用可以降低空气中PM2.5的浓度.以下做法中不利于降低PM2.5浓度的是____ .

A.将农作物秸秆在田间焚烧变为肥料 

B.燃煤锅炉增加脱硫、脱硝(氮)装置

C.加油站增加油气回收装置

Ⅱ.塑料是生活中常见的物质,大大方便了人类的生活,同时也带来了环境问题.

(1)生活中的下列塑料制品,不属于热固性塑料的是____ (填序号).

①电源插座 ②炒菜锅的手柄 ③食品包装袋

(2)废弃塑料带来的环境问题是____ .

(3)为解决上述问题,我们可以采取的措施有____ (答一条即可).

上一题 下一题 0.0难度 选择题 更新时间:2014-09-15 04:11:15

答案(点此获取答案解析)

增大煤炭与空气(或氧气)的接触面积,使燃烧更充分,吸附,A,③,白色污染,回收利用废旧塑料

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    It was a cold winter. The wind blew all night and the snow was blinding. When morning came, my three children and I got up and made our way to the windows. As we looked out the window, we saw that the henhouse was gone. Our three hens had been blown away.

    I looked at the emptiness outside. Then I saw all three chickens sat around the edge of a white bucket. How was this violent wind not blowing them into the field beyond? I quickly pulled on long snow pants and heavy winter coat, wrapped a scarf and stuck my feet into very large boots .

    I shouted at the wind as it blew. I was alone, save for my children. They stared out the window into the vast white sea of snow, their eyes peeled for any sign of movement. Outside I heard the sound of my boots as I walked against the wind.

    The snow circling around me, I steadily made my way to the soft cluck-cluck-cluck sound my hens always made. When I reached them, I saw that their little feet were holding on to the edge of the bucket, heads bent forward and away from the wind. I gently lifted each hen and put it carefully into the warm inside. Then I began the freezing walk back to the small shed directly behind our house. One by one I laid my chickens on the cold floor, and they began to cluck softly.

    As I shut the shed doors, my eyes went directly to the window where my children were watching. They jumped up and down cheering, and so did I! I wasn't some dragon slayer (屠龙者) from a fairy tale. I was simply a mom, but the look on my children's faces told me that they thought I was a hero mom.