高中英语第二学期第一课课文原文？！！

An eager beaver is a person who is always willing to do and is excited about doing what is expected of him.
Suppose,for example,that a teacher tells his students they each must solve one hundred math problems before coming to school the next day.The children complain about so much homework .But one student does not protest at all.That student is an eager beaver.He loves to do math problems,and does not mind all the homework.
The expression is said to have come from the name of a hard-working animal--the beaver.
Beavers are strange-looking creatures.They spend a lot of time in the water ,building dams to create little lakes or pouds.They use their huge teeth and work hard to cut down trees,remove branches and put them across streams.They use their tails to pack mud on the branches to make the dams solid.Few other animals work so hard.
Historians say the beaver had an important part in the settlement of North America.
There were hundreds of millions of be