5．
Some of the greatest problems we face today are the destruction （破壞） of our environment．Brown clouds，polluted water，endangered wild animals..，these problems 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 to drive…
But does it do any good？When I am the only one in line at the market with cloth bags，am I doing any good？Does my walking to stores make any real difference to the world？
I recently learned something about flamingos （火烈鳥） which like to get together in groups of a thousand or more．Every year，when the time comes for migration （遷徙），a few of them first takeoff from the lake．But none of the others seem to notice，so the small group returns．
However，the next day they try again．This time few more fly along with them，but most of them still pay no attention，so they return again．They try for several times．Every time a few more birds join in but，since the thousands of others still take no notice，the great migration plan is once more stopped．
Then one day something changes．The same small group of birds once again starts flying and a small number more join in just as before，then more．Finally，they all take flight and the migration really begins．
What a spectacular sight it must be-thousands of flamingos taking off into the sky at once!
A few can make a difference．Even if you're the one to take the first step，and continue trying，others will
someday take notice and together we will solve even our greatest problems．
61．Why does the writer use cloth bags in stores？A
A．Because he wants to do some good to the environment．
B．Because he thinks plastic bags are more expensive．
C．Because there are only cloth bags in stores．
D．Because all the people use cloth bags in stores．
62．Why does the small group of flamingos return to the lake？D
A．Because they are very tired．
B．Because there are some dangerous animals．
C．Because they can't find food out there．
D．Because the others don't fly along with them．
63．Which of the following is TRUE according to the passage？B
A．The writer and his family never walk．
B．Flamingos like to get together in groups of a thousand or more．
C．Brown clouds and polluted water are the only problems we face today．
D．Flamingos never travel to other places every year．
64．What can we know from Paragraph 3？D
A．The writer thinks everyone should do that．
B．There are many ways to solve the problems today．
C．The writer likes flamingos very much．
D．The writer is not sure he is doing the right thing．
65．What's the writer's purpose of writing this article？B
A．To show that the writer loves to see the migration of flamingos．
B．To tell readers to continue trying and it can make a difference．
C．To introduce a special kind of flamingo to readers．
D．To show that there're many problems in the world．
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