Trees are a renewable resource that when managed properly can ________our needs indefinitely.

A．identify
B．recognize
C．acquaint
D．claim

A．as far as energy source is concerned, salt water is useless because of its chemical properties
B．the working principle of an vibrating water column is to use water as a direct power driving a generator
C．Britain is pursuing a method that the Japanese have already put into practice
D．Britain is the most advanced country in developing new energy source