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.
小題1:The earliest frogs lived about          million years ago.
A．20
B．30
C．50
D．190
小題2:      can jump over 2m.
A．The Goliath Frog
B．The Common Wood Frog
C．The Poison Frog
D．The Australian Rocket Frog
小題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.

小題1:D
小題2:D
小題3:B

試題分析：這篇短文重點介紹了世界上的各種青蛙，詳細(xì)的描述了他們的生理特點及生活習(xí)性。
小題1:根據(jù)第一段The earliest known frogs lived about 190 million years ago 描述，可知選D。
小題2:根據(jù)The Australian Rocket Frog can even jump over 2m, 描述，可知選D。
小題3:根據(jù)最后一段When the temperature goes down, they become ice frogs. 描述，可知選B。
點評：本文淺顯易懂，層次分明，學(xué)生很容易把握文章中心內(nèi)容。答題中注意帶著問題閱讀短文，一般就能順利找出答題依據(jù)。對于不能直接找到根據(jù)的問題注意聯(lián)系上下文，根據(jù)短文中心總結(jié)出正確答案。
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