Chinese Premier Wen Jiabao, in_________ interview with Hong Kong reporters on April 13, said that Chinese economy in ________ first quarter showed signs of better than expected positive changes.

A．an, 不填

B．the, the

C．the, a

D．an, the

患者留置尿管超过多长时间，医院感染的发生率明显增高（）

A.12小时

B.24小时

C.36小时

D.48小时

E.72小时