A．the Eiffel Tower has lost its initial value

　　B．the Eiffel Tower has existed long enough

　　C．research done in the Eiffel Tower had unexpected payoffs

　　D．the Eiffel Tower was successfully preserved during the war

　　D

　　The vast jungles of the Amazon rainforest are home to tribes(部落)mostly isolated(隔绝的)from the outside world，whose way of life，largely unchanged for hundreds of years，is now increasingly threatened by modern civilization．

　　Now, scientists discover they can monitor these“uncontacted tribes”using satellites，which would allow inexpensive and safe tracking of these tribes in order to protect them from outside threats．

　　In order to help conserve these uncontacted Indians，researchers need accurate estimates of their populations．One way to collect this data involves flying over their villages，but such overflights are both expensive and could fill these native peoples with fear．Another strategy involves meeting individuals on the ground，but among other risks，scientists could accidentally spread disease to members of the tribes．

　　Instead，scientists investigated whether satellite imaging could monitor uncontacted tribes. The result was inspiring．They confirmed their locations and measured the sizes of their Village，houses and gardens．“We can find isolated vinages with remote sensing and study them over time．”Walker told Live Science．“We can ask：Are they growing?Do they move?”

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