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简介：
The world of out-of-doors is full of secrets. And they are so interesting that quite a lot of people are busy studying them. All around us are birds, animals, trees and flowers. The facts about how they ____ and grow are as interesting as anything could be.
Do you know that one of the great Presidents of the USA spent hours and hours ____birds? A businessman who lives near New York city became so____ in insects that he began to collect them. He now has more than one thousand different kinds carefully____ in glass boxes.
Come then with me, and I will help you find some of nature’s secrets. Let us go____through the woods and fields. Here we shall find now a rabbit tells the other rabbits that there is danger. We shall ____a
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