A．To ask if she’ s got the tickets.

B．To invite her out for an evening.

C．To offer his help with her new flat.

D．To take care of his friend.

某山村儿童牙齿有黄斑的人数增多，应作何种进一步检查

A．尿镉

B．尿铅

C．尿氟

D．头发汞

E．血铅