单项选择题
Economic benefits must be weighed（）the possible dangers of handling radioactive waste.
A.by B.with C.against D.out
单项选择题 She declined to travel at the（）of her company and paid for the trip herself.
单项选择题 She is（）treatment at the hospital
单项选择题 The couple wanted to（）the black child they had been fostering.
