While ________ the dog, you should take care not to ________. Otherwise, it may be dangerous to strangers.

A．walking; get loose

B．walk; be loose

C．walking for; get it loose

D．training; get it run

一问宿舍可住多个学生，则实体宿舍和学生之间的联系是

A．一对一

B．一对多

C．多对一

D．多对多