完形填空 通读下面的短文，掌握其大意，在每小题所给的四个选项中，选出最佳答案，并将答案写在答题卷上。
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 mother bear and her young ones as they look for____ and get ready for winter sleep. We shall watch bees dancing in the air to let other bees know____ they can find food. I will show you many other interesting things, but the thing that I can____ you is to keep your eyes and ears ____ when you go out of doors. Nature tells her secrets only to people who look and listen carefully.

A．bear B．live C．speak D．fly

A．studying B．eating C．learning D．finding

A．friendly B．carefully C．busy D．interested

A．locked B．kept C．put D．filled

A．near B．quickly C．quietly D．politely

A．hear B．follow C．catch D．help

A．food B．fruit C．vegetables D．water

A．how B．why C．where D．when

A．make B．pass C．give D．teach

A．closed B．open C．safe D．Clean