题型：完形填空 题类：常考题 难易度：困难
四川省成都市树德一高2020-2021学年高二下学期英语4月月考试卷（含听力音频）
Some of the greatest problems we face today are concerned with the gradual destruction of our environment. Brown clouds; wildlife 1; polluted water. These 2 all seem so huge. So my family does what we can. We take cloth bags to stores instead of using plastic bags. We walk where we don't have to3.
But does it do any good?
I recently learned something about flamingos. These beautiful birds gather in4 groups of a thousand or more. Every year, when the time 5 for migration, a few flamingos start the process by taking off from the lake. But 6 of the others seem to notice, so the tiny group returns.
However, the next day they 7 again. This time a few more struggle along with them, but the vast majority still8 no attention, so these pioneers come back.
The9 continues for several more days. Every time a few more birds join in but,
10 the thousands of others still take no 11 , the great migration plan is once again 12.
Then one day something13. The same small group of birds takes wing and a tiny number more join in, just as before. And this time their total number, though still quite 14, is enough to tip the balance. As one, the whole group takes flight and the migration15. What a16 sight it must be – thousands of flamingos taking to the sky at once!
A few can make a17. It's true that all of the great problems of the world have been solved because of the18 efforts of a few.
If you believe in a cause, don't 19! Others will someday take notice and together we will20 even our greatest problems.
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