Scientists have done a lot of r_ on dinosaurs sinse long ago.

Scientists have done a lot of r_ on dinosaurs sinse long ago.

题目
Scientists have done a lot of r_ on dinosaurs sinse long ago.
It'll be a very long p_ for the victims in Sichuan to rebuild their homes.
答案
  1. reasearches 研究

 2. period 阶段

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