— ______ your telephone number?    —6873214. [ ]

A. How much is

B. How many are

C. What is

D. How many is

铅中毒发展到一定程度主要表现（）。

A.贫血

B.白血病

C.腹绞痛

D.肺心病

E.中毒性周围神经炎