属清洁能源，故A项正确。

答案：A

Ⅳ.阅读填句

　　Organic gardening is the means of growing vegetables as well as fruits with the usage of things just identified in nature.

　　Why will one wish to delight in organic gardening?

　　1．　　1　 Though this is a bit much more time-consuming than getting ready chemical pesticides as well as fertilizers，it definitely aids to place garbage to good usage as well as save the environment.

　　2．Organic farming does not make use of chemicals.　　2　　 This is especially vital when expanding vegetables.Chemical companies tell us that the chemicals we make use of are harmless if used according to the direction，but investigation shows that very small quantities of poisons absorbed through the skin may create such things as cancer，especially in kids.

　　On the average，a kid eats four to five times much more cancer-causing pesticides from foods than an adult.This may cause different illnesses later on in the little one's life.　　3　　 Don't forget that pesticides have poisons to kill living things.

　　3．Less damage to the environment.Poisons are typically released into our waterways，triggering death to the native fish as well as polluting their place.　　4　　

　　4．Fee savings.One does not have to buy costly chemical fertilizers as well as pesticides with organic gardening.Many organic dishes for the control of bugs as well as illness come right from the kitchen area cabinet.　　5　　 An example of this is the marigold，which aids to keep insects away from vegetables.

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