黄小伟希望在10年后为儿子累积一笔20万元的高等教育金，年投资报酬率为10%，利用EXCEL计算他现在起每年年底应为教育金目标做多少投资。下列函数表达中，正确的是______。

A．PMT(10%，10，0，20，1)
B．PMT(10%，10，0，20，0)
C．PMT(10%，10，20，0，1)
D．PMT(10%，10，20，0，0)

A child is sent to the school nurse because, according to his teacher, he’s constantly scratching his head. When the nurse assesses his hair and scalp, she finds evidence of lice. What did she probably see（）

A. Flaking of the scalp with pink, irritated skin exposed.

B. Small white spots that adhere to the hair shaft, close to the scalp.

C. Scaly, circumscribed patches on the scalp, with mild alopecia in these areas.

D. Multiple tiny pustules on the scalp with no abnormal findings on the hair shafts.