Surprisingly，based on the sizes of the houses and Villages，the scientists find the population densities of these isolated villages are about 10 times greater，on average，than other villages of native Brazilian peoples．This may be due to the fact that they have to live closer together because they are not as good at clearing the forest，since they lack modern devices like chainsaws and tractors，the researchers said．The tribes may also be afraid of spreading out due to fear of being attacked by outsiders，Walker said.

　　The researchers now plan to focus on 29 more isolated villages to“look at their ecology—that is．distance from rivers and roads—and use this to model where else we can find more isolated villages，”Walker said．

　　32．What is the main idea of the text?

　　A．Amazon tribes are disappearing．

　　B．Scientists found isolated Amazon tribes．

　　C．Modern civilization is threatening Amazon tribes．

　　D．Isolated Amazon tribes are monitored with satellites．

　　33．Scientists don't want to meet the Indians on the ground due to the fear that_______

　　A．they can’t get accurate data

　　B．they will be attacked by the Indians

　　C．they could pass disease to the Indians

　　D．they will catch disease from the Indians

　　34．What do scientists find about the tribes?

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