閱讀理解
       Frogs are animals that can live both in water and on land. There are more than 5,000 kinds of frogs
on the earth. The earliest known frogs lived about 190 million years ago and the frogs today still look the
same. Here are some fun things that you might not know about frogs. Enjoy!
       The Biggest and the Smallest Frogs
       Some frogs can be very big. The biggest kind of frog is the Goliath Frog in West Africa. Its body can be nearly 30cm long, about the size of a large cat. The Gold Frog and the Poison Frog are the smallest
frogs in the world. They are less than 1cm long. Though the Poison Frog is very small, it is not weak at all. It is dangerous. Any animal that eats it will die very soon.
       The Best Jumpers
       Frogs are very good at jumping. They developed jumping legs so that they would not be eaten by
other large animals. Using their big strong legs, more frogs can jump over 20 times their own length. It is
like a person jumping over about 30,48. The Australian Rocket Frog can even jump over 2m, which is
50 times its body length(5.5cm). That might be the reason why frogs are called the best jumpers on the
earth.
       The Cryogenic Animal
       Some frogs like the Common Wood Frog have a special ability to live in very cold places. When the
temperature goes down, they become ice frogs. 2/3of their body water freezes. Their hearts stop, and
their breathing stops too. You may think they are dead, but in fact they are not. Maybe we humans can
learn the way that the frogs do for medical purpose.
1. The earliest frogs lived about ________ million years ago.
A. 20  
B. 30  
C. 50  
D. 190
2. The Gold Frog is one of the ________ frogs on the earth.
A. smallest  
B. biggest  
C. strongest  
D. weakest
3. ________ can jump over 2m.
A. The Goliath Frog  
B. The Common Wood Frog
C. The Poison Frog  
D. The Australian Rocket Frog
4. What will happen to a Common Wood Frog at very low temperature?
A.It will die very soon.  
B. It will be an ice frog.
B.It will become dangerous.  
D. It will become very small.


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in the area

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at night

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The reason for an earthquake is ________．

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