The world of the out-of-doors is full of secrets. And they are so interesting that quite a lot of people are busy 【小题1】 them. All around us are birds, animals, trees and flowers. The facts about how they live and grow are as interesting as anything could be.

Do you know that the great presidents (总统) of the USA spent hours and hours 【小题2】 (study) birds? A business, who lives near New York City became 【小题3】 interested in insects (昆虫) that he began to collect them. He now has more than one thousand different kinds 【小题4】 (careful) kept in glass boxes.

Come along with me, and I will help you find scene of nature’s secrets. Let us go quietly through the woods and fields. Here we shall find how a rabbit tells the other rabbits that there is 【小题5】 (dangerous). We shall follow a mother bear and her young 【小题6】 (one) as they look for food and get ready for winter sleep. We shall watch bees dancing in the air to let other bees 【小题7】 (know) where they can find food. I will show you many other interesting things, but the 【小题8】 (good) thing that I can teach you is to keep your eyes and ears 【小题9】 (open) when you go out of doors. Nature tells her secrets only to people 【小题10】 look and listen carefully.

In autumn, leaves drop to the ground. Many trees have nuts or【小题1】. Animals may begin to store（储存）food. Some birds【小题2】nuts and acorns (橡果) to store. Other birds fly to a【小题3】place for winter. They won’t return until spring. Days become shorter. Cold weather is coming. People wear warm clothes and prepare for winter. In some areas there may be rain or snow, but in many southern areas it is still warm. Autumn is also the time when farmers harvest（收获）their crops. People like autumn for many reasons(理由). The most【小题4】one is that autumn is the harvest season.