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问题 单项选择题

晴朗的天空呈现蔚蓝色，是由于太阳光穿过大气层时（）

A.直接到达地面的蓝光比重大

B.空气分子使蓝光发生散射作用

C.高层大气分子大量吸收蓝色光

D.到达地面的蓝色光又完全被反射到高空

答案

参考答案：B

单项选择题

Three weeks after the application of the spica cast following surgery for an infant, the mother told the nurse that the infant's toes are swollen and cool to the touch. Which of the following would the nurses suspect

A．Cotton wadding lining of the cast has shrunk.

B．An infection has developed under the cast.

C．Child's feet were in a dependent position.

D．Child has outgrown the spica cast.
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单项选择题 A1/A2型题

痰滞、浊气所引起的肉瘤、筋瘤和气瘤，宜应用的治疗方法为（）。

A.化痰散结法

B.清热利湿法

C.利水消肿法

D.舒肝理气法

E.行气散结法
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