摘要： A.another 另一个.the other 其他所有的.others别的人 70 Crocodiles 1 their eggs and leave them under leaves or sand. Baby crocodiles use their teeth 2 their way out of the shells (壳). Crocodiles only live 3 it is hot. They are found in Australia 4 America. They spend most of 5 time lying around in the rivers. The crocodiles’ long tail 6 when the animal is swimming. It is an excellent weapon. It 7 be used to strike the 8 . One blow will knock 9 a man or even a big animal at 10 . The crocodile has a hard neck. It cannot turn its 11 from side to side and so it can 12 see in front of itself. The crocodile has its teeth 13 by the crocodile bird. For its food this bird takes the bits in the crocodile’s mouth. This helps the crocodile a lot 14 it cannot move its tongue up and down. 15 its terrible teeth it catches its food. The food may be a fish, an animal, or even a careless man.
When you hear the word “scitentist”, what do you think of? Many people think scientist are people in clean white coats who work in labs．And some scientists do work in labs．But there are 1 scientist who work in woods and jungles．These scientists are called “animal behavior(行为)scientists”, and they study animals as they live in nature．
Why don’t these scientists catch animals and study them in zoos? The 2 is in the word “behavior”．Animals behavior scientists want to learn 3 animal behave in their wild homes．When animals live in cages(笼子)or in zoos, they do not act the same as they do when they are 4 ．They may fight 5 each other, or they may not eat, or they may not raise(抚养)their babies as they usually would．To see real animal behavior, scitentists must go where the animals 6 ．
So animal behavior scientists go into the jungles, the woods or the desert．There, their most important 7 are their eyes and ears．They watch and listen to the animals very 8 ．They write down everything that happened in notebook． 9 they live near the animals, the scientists are careful not to frighten them．If the scientists are luncky, the animals will １０ no attention to them．Then the scientists can see how the animals really live．
The behavior scientists hope what they’ve learned about animal behavoir can provide clues(提供线索)to help people learn to live together more happily．
Mr.Smith lives in the country, but He works in an office in a big city．He 1 to work by train every morning and comes 2 in the same way．
One morning while Mr.Smith was 3 his newspaper on the train, a man sitting behind him tapped (轻拍)him on the shoulder (肩膀)．The man said 4 to him and began to talk to him．The man said, ”Your life is interesting, 5 it? You take the same station at the same time 6 morning, and you always sit in the 7 seat and read the same news-paper．”
When Mr.Smith 8 this, he put his newspaper down, turned back and said to the man angrily, “ 9 do you know all that about me?”
“Well, I 10 sit in the same seat behind you, the man answered．
Some scientists believe that there are three kinds of memory－immediate, short-term and long-term．
1 memory holds items of information coming into 2 from the five senses for less than a second．Then it either rejects them 3 passes them into short-term memory．
Short-term memory 4 ．hold about seven items of information 5 one time(e.g., telephone numbers), it holds them for about thirty seconds．Then they are rejected(拒绝)(i.e., forgotten)or 6 into long-term memory．
7 memory can hold information for the whole of our lives．Some scientists believe that long-term memory can 8 into two types． 9 type remembers events, that is things that happen to us． 10 remembers knowledge(e.g., the names of countries or the meanings of words)．