答案：C

　　20.A.about

　　B.enough

　　C.lot

　　D.many

　　解析：由语境可知，父亲非常愿意给孩子们读书。care后接不定式，表示“努力做”，副词enough表示程度。故答案选B。

　　答案：B

　　.阅读理解

　　Sports can help you keep fit and get in touch with nature.However，whether you are on the mountains，in the waves，or on the grassland，you should be aware that your sport of choice might have great influence on the environment.

　　Some sports are resource­hungry.Golf，as you may know，eats up not only large areas of countryside，but also tons of water.Besides，all sorts of chemicals and huge amounts of energy are used to keep its courses (球场) in good condition.This causes major environmental effects.For example，in the dry regions of Portugal and Spain，golf is often held responsible for serious water shortage in some local areas.

　　There are many environment­friendly sports.Power walking is one of them that you could take up today.You don't need any special equipment except a good pair of shoes；and you don't have to worry about resources and your purse.Simple and free，power walking can also keep you fit.If you walk regularly，it will be good for your heart and bones.Experts say that 20 minutes of power walking daily can make you feel less anxious，sleep well and have better weight control.

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