— What did the doctor say?

— His advice was that you ______ do more exercise. [ ]

A. had to

B. would

C. should

D. needed to

日本血吸虫卵能进入肠腔随粪便排出体外的原因有（）.

A.肠蠕动增强

B.腹内压增高

C.血管内压增加

D.卵内毛蚴分泌物破坏肠壁

E.肠道细菌协同作用