If we find a bird nest,we will have a good place of observing (观察)and knowing about birds.

Birds sit on eggs and take care of their baby birds from April to June. Because the baby birds are too young to leave the nests,the mothers often leave and come back to the nests during the time to look for food. So it is good to observe birds. When we observe birds,we'd better hide ourselves in a close place to the nest,and it's better to use binoculars.

But how to make a bird nest? It's very easy. If you want to make one,please follow these:

a)  Each nest must have six boards (板).Don't make the boards too slippery (滑的).

b)  Dig a small hole in the front of the nest as a door. The door is big enough for a bird to fly in or out easily.

c)  Make sure that the rainwater doesn't go into the nest.

d)  One piece of the boards should be easy to open.

e)  Please don't forget to colour the nest.

(   ) 26. The most important thing in observing birds is to      

A. look for a place near the nest    B. climb trees

C. write down notes every day    D. make a bird nest

(   ) 27. When we are observing birds,we have to hide ourselves to .

A. look after them             B. use the binoculars

C. make them do everything as usual  D. catch the birds at last

(   ) 28. If we make the nest too slippery, .

A. it is not strong    B. it is not easy to make

C. it is not very beautiful    D. it is very difficult for the birds to hold or stand in

(   ) 29. We should leave a hole in the front of the nest so that      

A. we can clean the nest    B. the birds can fly in or out

C. we can hang it easily    D. it is easy to make

(   ) 30. What is the passage mainly about?

A. Birds and men. B. Playing with birds.

C. Observing birds and making bird nests. D. Listening to the songs of birds.

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