The diversity of tropical plants in the region represents a seemingly ______ source of raw materials, of which only a few have been utilized.

A．exploited

B．controversial

C．inexhaustible

D．remarkable

下列关于JDK目录结构的说法，错误的是( )。

A．bin目录下有许多工具

B．demo目录下有各种演示例子

C．include目录下都是库文件

D．jre目录是Java程序运行环境的根目录