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    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. The Australian Rocket Frog can even jump over 2m, which is 50 times its body length (5.5 cm). 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.
    小题1:The earliest frogs lived about          million years ago.
    A．20
    B．30
    C．50
    D．190
    小题2:      can jump over 2m.
    A．The Goliath Frog
    B．The Common Wood Frog
    C．The Poison Frog
    D．The Australian Rocket Frog
    小题3: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.
    C．It will become dangerous.
    D．It will become very small.

    小题1:D
    小题2:D
    小题3:B

    试题分析：这篇短文重点介绍了世界上的各种青蛙，详细的描述了他们的生理特点及生活习性。
    小题1:根据第一段The earliest known frogs lived about 190 million years ago 描述，可知选D。
    小题2:根据The Australian Rocket Frog can even jump over 2m, 描述，可知选D。
    小题3:根据最后一段When the temperature goes down, they become ice frogs. 描述，可知选B。
    点评：本文浅显易懂，层次分明，学生很容易把握文章中心内容。答题中注意带着问题阅读短文，一般就能顺利找出答题依据。对于不能直接找到根据的问题注意联系上下文，根据短文中心总结出正确答案。
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