Feeding a large family, _____ did hard physical work every day, required a lot of food.[ ]

A. all of members

B. all of whose members

C. all members of whose

D. of whose all members

对于药物降解，常用降解百分之多少所需的时间为药物的半衰期

A、5%

B、10%

C、30%

D、50%

E、90%