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Many kinds of birds live in the United States, but the number of the birds is becoming smaller every year．One of the leading reasons is the growing number of pet cats．By keeping your pet cats in your home, you can help give birds a better possible chance to live．
Of the 90 million pet cats in this country, about two－thirds are allowed to go outside．It is said that these cats kill hundreds of millions of birds each year, as well as billions of small animals such as rabbits and field mice．
They can also bring illness to the animals that live in people's yard(院子), further weakening the health of the natural populations．
Allowing pet cats to go outside is not just bad for birds and wildlife, it's also bad for the cats themselves．Outdoor cats can get sick very easily．They are in danger from traffic and attacks(攻击)from other animals．In fact, outdoor cats usually don't live past the age of five, while indoor cats often live to be 17 or older．
Keep your pet cat inside! If you raise a young cat, it's your duty to let it play inside．
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You have probably heard the expression，“It’s raining cats and dogs outside．”That means16 it，S raining very hard I not that 17 cats and dogs are falling from the 18 ．However，one day in June，1882，it really did rain 19 over Dubuque，Iowa．The frogs 20 falling along with hailstones(冰雹)during a 21 storm．
Hail is formed when drops of rainwater are 22 by heavy winds and are carried high up into the air．There the raindrops become frozen．Many drops may freeze 23 to form balls of ice；these ice balls，or hailstones，then 24 to earth．
During the storm in Dubuque，the strong winds lifted small frogs from nearby ponds(池塘) 25 the air along with raindrops．When some of these frogs became covered with ice，both hailstones and“frog-stones”fell onto the ground．
16．A．that B．how C．why D．if
17．A．careless B．
blind C．dead D．real
18．A．hill B．tower C．sky D．building
19．A．cats B．frogs C．dogs D．birds
20．A．stopped B．enjoyed C．began D．forgot
21．A．popular B．terrible C．weekly D．common
22．A．divided B．added C．changed D．caught
23．A．together B．alone C．so D．almost
24．A．hold B．lose C．keep D．fall
25．A．from B．into C．after D．by
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friend of his, comes to see him. When he sees two holes (洞) in the door-a big hole and a small one. He is
very surprised and says,"My dear friend, why do you make two holes in your door?" "Let the cats come in
and go out," Mr.Green answers. "But why are there two holes? Isn't one enough?" he says,"How can the big
cat go through (过) the small hole?" he says.
( )1. Mr. Lee has two cats.
( )2. One day, Mr. Lee goes to Mr. Green's house to see the cat.
( )3. There are two holes in the door.
( )4. Mr. Green is a clever man.