根据句意及所给首字母提示，写出正确单词。

  1. It’s dangerous for animals to drink if the water become p        ．

  2. Some animals are g         and friendly to people．

  3. This is a babital that has never been d          by people.

  4. The nose of the elephant is about two meters l               .

对固定资产实行委托运营的，资产的（）可以全部或部分交由受托单位履行。

A.使用保管职责

B.价值管理

C.实物管理

D.价值管理和实物管理