The shopkeeper said they _____ the shoes ______. A. have sold out ; in my size B. sold out ; of my size C. had sold out ; for my size D. had sold out ; in my size
Unfortunately, the research was limited __________ increasing economic profits, _________ protecting the environment. A. to; other than B. by; rather than C. to; rather than
。A的n溴代物的同分异构体的数目和m溴代物的同分异构体的数目相等，则n和m一定满足的关系式是（ ） 