求一篇结构按照cause and effect 的模式的英语作文,字数不限,

求一篇结构按照cause and effect 的模式的英语作文,字数不限,
求一篇结构按照cause and effect 的模式的英语作文,字数不限,

求一篇结构按照cause and effect 的模式的英语作文,字数不限,
Why We Walk in Circles?
It is a well-known fact that a person will move in a circle when he cannot use his eyes to control his direction. Pitch-dark nights, dense fogs, blinding snow- atoms, thick forests— all these can keep a traveler from seeing where he is going. Then he is unable to move in any fixed direction but walks in circles.
Animals act the same way. You have probably heard the saying, “running around like a chicken with its head cut off”. Blind birds fly in circles； and a blind- folded dog will swim in circles.
Have you wound up a toy automobile and started it off across the floor? Then you know that It will rarely travel in a straight line. It will travel, instead, in some kind of arc, or curve. If it is to travel in a straight path, the wheel on both sides have to be exactly of equal size. If they are not, the little automobile turns toward the side with smaller wheels.
Circular movement in walking is caused in much the same way. In most people, muscle development is not the same in both legs, so that the steps will be uneven. The difference may be so small that no one is aware of it. But small as it is, it can cause circular movement. By the same rule, a bird’s wings do not develop evenly,and so it will fly in circles when blinded.

The rivers near our city have been seriously polluted recently. The clear water has gone. There used to be many fishes swimming freely in it. But now they are gone. Many factories in the city pour the...

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The rivers near our city have been seriously polluted recently. The clear water has gone. There used to be many fishes swimming freely in it. But now they are gone. Many factories in the city pour the waste into the rivers. The villagers throw much rubbish in to the river. And day after day, the once beautiful rivers have turned into smelly and dirty dustbins.

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