— What should I do with this passage?

—_____ the main idea of each paragraph.

A．Finding out

B．Found out

C．Find out

D．To find out

痒疹的临床特点有()

A．多认为与变态反应有关

B．分小儿痒疹与成人痒疹两种

C．好发于四肢伸侧

D．周围血中嗜酸粒细胞可增加