There are many kinds of pollution around us,1 air pollution, soil pollution, noise pollution and light pollution. They are bad 2our health in many ways.

    Burning gas, oil and coal creates air pollution. It can cause sore eyes and 3 problems.

    With the increase of pollution and the 4 of industry, litter is everywhere. It makes our environment dirty. People put lots of rubbish in the land. Farmers use too many chemicals in the fields. They destroy the soil. So soil pollution has become serious.

    Noise pollution can make people 5 For example, people may lose their hearing if they work in a 6 place for a long time. Too much noise can cause high blood pressure 7

    Working for a long time in strong, changeable light 8 cause some kind of illnesses. It makes people feel 9 and is especially bad for the eyes.

With 10 pollution, our planet will become greener and our health will be better. Let's be greener people.

已知方程组$\left\{\begin{array}{c}3x+5y=m+2\\ 5x+3y=m\end{array}\right.$的解x、y互为相反数，求m的值．

向含有AgNO₃、Cu（NO₃）₂、Zn（NO₃）₂的混合溶液中加入一定量的铁粉，使其充分反应后，过滤，向滤渣中滴加稀盐酸，有气泡产生，则下列结论正确的是（　　）

根据对话的情景，从方框中选择适当的句子补全对话。其中有两项是多余的。

(In the classroom)

Kangkang: What's over there, Jane?

Jane: Where?

Kangkang: ____  

Jane: Let's go and see. Oh, it's a black bag. ____  

Kangkang: No, mine is brown. I think it's Lin Tao's.

Jane: ____  

Kangkang and Jane: Hi! Lin Tao! Is this your bag?

Lin Tao: ____ Oh, yes, it's mine. Thank you very much.

Kangkang and Jane: ____ 

17世纪60年代至18世纪60年代，英国东部地区发生了农业技术革命。其中一项新技术叫做“四区轮作制”，即分别在农场的四块士地上种植芜菁、小麦、萝卜、大麦，四年里轮流更换，不让任何地块休闲，同时又能保持地力。这一革命（    ）