Such poets as Shakespeare _____ widely read, of whose works, however, some _____ difficult to understand.

A．are; are

B．is; is

C．are; is

D．is; are

在对疾病"胃溃疡急性出血性贫血"进行编码时，主要编码应为（）。

A.K25.0（急性胃溃疡）

B.D64.9（贫血）

C.D62（急性出血性贫血）

D.以上3个编码均可作为主要编码

E.K25.0和D62任选一个作为主要编码