题目内容：

完形填空

阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填人空白处的最佳选项，并在答题卡上将该项涂黑。

Some adults spend a lot of time trying to stop children playing. They are usually people who think of play as being the       of work and therefore a waste of time. For humans, work is a way of getting food to eat, and like humans,        must spend time doing the        things. Regardless of this, children        playing, and so do other young animals. It is quite        to keep both a small child and a young cat        for hours with a piece of paper.

Hunting may be the most obvious skill        in play, but it is far from being the only one. Lambs and goat kids play       , although they will never        anything other than some grass. But for these young animals too,        is an important part of learning. Sheep and goats are       hill and mountain animals. Running and skipping exercise young legs and develop a strong sense of        that will keep them safe on the steepest rocks.       animals play, is not so different.        trees and catching flies are not the most obvious training for the adult world, but the flexibility        in these activities is similar to that required of a bus driver or businessman.

What we know about animals shows us that playing is a very good way of       , so maybe one of the best ways for        to learn is also by playing. Children find playing is fun, but       notice that they are also learning at the same time. Most people continue to play games long after they have become       , and perhaps that is because we rely so much on our        to learn.

1.A. reward        B. opposite        C. basis           D. nature

2.A. animals       B. children        C. parents         D. cats

3.A. same          B. ordinary        C. dull            D. chief

4.A. delay         B. regret          C. enjoy           D. ignore

5.A. possible      B. necessary       C. reasonable      D. difficult

6.A. annoyed       B. alarmed         C. amazed          D. amused

7.A. kept          B. practiced       C. tested          D. required

8.A. endlessly     B. clumsily        C. crazily         D. aggressively

9.A. hunt          B. plant           C. learn           D. catch

10.A. jump         B. work            C. play            D. walk

11.A. strangely   B. initially        C. naturally       D. equally

12.A. direction    B. space           C. distance        D. balance

13.A. Based on    B. Compared with    C. Inspired by     D. Developed form

14.A. Climbing    B. Growing          C. Watering        D. Cutting

15.A. reduced     B. allowed          C. damaged         D. needed

16.A. learning    B. exercising       C. improving       D. growing

17.A. adults      B. creatures        C. humans          D. students

18.A. generally   B. hardly           C. possibly        D. truly

19.A. mature      B. wise              C. athletic        D. strong

20.A. flexibility B. liberty          C. responsibility  D. curiosity