透射光强度与入射光强度之比称为吸光度。（）
参考答案：错
In order to keep fit, you will take exercise ________ and eat healthily. [ ]
A. regularly
B. generally
C. approximately
D. extremely
下列关于水的物理现象描述错误的是( )。
A．蒸发时放热，结冰时吸热
B．蒸发时吸热，结冰时放热
C．结冰和蒸发时都吸热
D．结冰和蒸发时都散热
