从物权的存在以它所从属的权利的存在为前提，主物权消灭时，从物权也随之消灭。
参考答案：对
These young trees must .
A．look after well
B．be well looked after
C．take good care of
D．be taken good care
包裹保价费按声明价格的（）计算。
A、1%
B、0.1%
C、2%
D、10%
