1, It causes ill-health in humans.

2,  there are laws limiting the amount of smoke that factories can produce.

3, Doctors have proved that air pollution causes lung diseases.

4, Yes, there is. The lead-in petro produces a poisonous gas, which is often collected in busy streets circled by high buildings. 

5,  Children who live in areas where there is a lot of lead in the atmosphere cannot think as quickly as other children, and are clumsy when they use their hands.

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Nửa chu vi:

104:2=52m

Chiều dài:

52:(3+10)x10=40m

Chiều rông:

52-40=12m

Diện tích mảnh vườn:

40x12=480m²

Số tạ thóc:

480x5=2400kg=24 tạ

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