斑蝥中斑蝥素的含量测定采用（）
A．重量法
B．硝酸银滴定法
C．紫外-可见分光光度法
D．气相色谱法
E．高效液相色谱法
参考答案：D
The old teacher lay wide awake on his bed, ___________ all the problems he had to deal with the next day.
A．thought about
B．to think about
C．thinking about
D．having thought about
无条件测量身高和体重时，普查5岁以下小儿的营养状况可以测量（）
A.头围
B.坐高
C.胸围
D.腹围
E.上臂围
