---I think maths is playing a more important part in the new test system. What about you?    --- ______. We should be more devoted to it.

A．No pains, no gains.

B．Fact speaks louder than words.

C．Great minds think alike.

D．Don’t claim to know what you don’t know.

江南某镇居民共饮一条河水，于7月中旬先后有近百人发热，均伴有乏力、纳差，部分病人腹泻或便秘。检查：大部分发热病人有肝脾肿大，少数病人前胸或上腹部有暗红色皮疹，怀疑为伤寒流行。

对正在发热病人进行哪项检查最有助于明确诊断（）

A.肥达反应

B.血培养

C.骨髓培养

D.大便培养

E.尿培养