People Watchers

Some scientists do not wear laboratory coats（coat）. And only_____（41） （rare）do they use microscopes. These scientists are called _____（42） （society） scientists. They want to find out bow people act and why they do certain things.
Som eof them study the people of _____（43） （differ） cultures to learn their ways of doing things. They often live with the people of the culture they are _____（44）（study）. They try to feel the world of these people. And they must be good reporters because facts, not _____（45） （opinion） about other cultures, must bereported.
Another group of them studies how people _____（46） （live） long ago. They dig in the ground to find old tools that have been _____（47） （bury） for thousands of years. Sometimes, they even discover buildings hidden in the earth.

These scientists often work in _____（48） （cooperate） with each other. If one of them _____（49）（find） a Greek vase（花瓶）in the Middle East, he or she may ask for an _____（50） （explain） from an expert to find out how the vase got there.