百叶箱的作用是防止太阳对仪器的（）和地面对仪器的（），保护仪器免受强风、雨、雪等的影响，并使仪器感应部分有适当的（），能真实地感应外界空气温度和湿度的变化。

A. ls
B. quit
C. get
D. put

A class’s finalize（） method CANNOT be invoked explicitly.
B. super.finalize（） is called implicitly by any overriding finalize（） method.
C. The finalize（） method for a given object is called no more than once by the garbage collector.
D. The order in which finalize（） is called on two objects is based on the order in which the two objects became finalizable.