人口的快速增长是破坏或改变野生生物栖息地和过度利用生物资源的最主要原因。

关于自然界的水循环，下列说法中正确的是（　　）

化简$\sqrt{{\left(-3\right)}^2}$的值是（　　）

   Many people like pandas very much. They are very 1   . Most of them live in Sichuan,    2  .  They    3 white hair,  but their shoulders,  legs,  ears and eyes are    4  . Pandas are usually heavy,  but they can climb trees like  5   animals.
   Pandas’ favorite food is bamboo    6  . But long long ago(很久很久以前),  pandas liked to eat meat. It takes pandas a lot of time to have food every day. When pandas are full(吃饱的),  they like    7 . They relax many hours every day.
   However, there are   8   pandas in the world today.    9   some people cut down (砍伐) too many bamboo trees and pandas can not find enough(足够的) food.
   I think we must    10   them