Scientists Without Laboratories
When you hear the word“scientist”．what do you think of？Many people think scientists are people in clean white coats who work in labs．And some scientists do work in labs．But there are________scientists 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________is in the word“behavior”．Animal behavior scientists want to learn________animals 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________．They may fight________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，scientists must go where the animals_______．
So animal behavior scientists go into the jungles，the woods or the desert．There，their most important________are their eyes and ears．They watch and listen to the animals very________．They write down everything that happened in notebooks．________they live near the animals，the scientists are careful not to frighten them．If the scientists are lucky，the animals will______no attention to them．Then the scientists can see how the animals really live．
The animal behavior scientists hope what they’ve learned about animal behavior can provide clues(提供线索)to help people learn to live together more happily．

A．another B．other C．others D．the other

A．answer B．question C．problem D．text

A．when B．where C．how D．why

A．happy B．free C．sad D．angry

A．of B．among C．for D．with

A．live B．run C．play D．eat

A．machines B．tools C．thoughts D．ways

A．truly B．carefully C．wonderfully D．nicely

A．But B．Unless C．Though D．As if

A．pay B．spend C．take D．cost