The old man had to do all the farm work himself, ________? [ ]

A. did he

B. had he

C. didn`t he

D. hadn`t he

肠道畸形所致的肠梗阻多见于（）。

A．新生儿

B．2岁以内小儿

C．3岁以上儿童

D．青壮年

E．老年人