— I heard they went skating in the mountains last winter.

— It _____ true because there was little snow there.

A．may not be

B．won’t be

C．couldn’t

D．mustn’t be

丝虫病患者可出现（）

A.淡黄色尿

B.淡红色尿

C.酱油样尿

D.深黄色尿

E.乳白色尿