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  1  and grow are as interesting as anything could be. Do you know that one of the greatest presidents of the USA spent hours and hours  2  birds? A businessman who lives near New York city became so  3  in insects that he began to collect them. He now has more than one thousand different kinds carefully  4  in glass boxes. Come then with me, and I will help you find some of nature’s secrets. Let us go  5  through the woods and fields. Here we shall find how a rabbit tells the other rabbits that there is danger. We shall  6  a mother bear and her young ones as they look for  7  and get ready for winter sleep. We shall watch bees dancing in the air to let other bees know  8  they can find food. I will show you many other interesting things, but the thing that I can  9  you is to keep your eyes and ears  10  when you go out of doors. Nature tells her secrets only to people who look and listen carefully.

—How ____ the medicine tastes!

—Yes. But the medicine will really work soon after you take it.

A．terrible           B．delicious          C．sweet            D．nice

语音

找出下列各组单词中画线部分的发音有几种读音

A. 一种              B. 二种             C. 三种            D. 四种

 — My brother’s ill in hospital.

— I’m sorry ______ that.

A．hear             B．hearing           C．to hear           D．heard

Don’t eat that meat．It smells________．

        A．dirty         B．delicious     C．bad      D．badly