单项选择题

在紫外-可见分光光度法中宜选用的吸光度值范围为（）。

A．0～0.2
B．0.1～0.3
C．1.0～2.0
D．0.2～0.8

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单项选择题

（　　）是老年人最显著的特点。A、老化B、沉默C、怀旧D、孤独感

单项选择题

What is the main idea of this passage?

A．Anger should be dealt with in a proper way.
B．Different people deal with anger in different ways.
C．Doctors suggest dealing with anger by repressing it.
D．The best way to deal with anger is to laugh when angry.