22, in recent years cattle breeders have increasingly used crossbreeding, in part that their steers should acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor. a, in part that their steers should acquire certain characteristics b, in part for the acwuistion of certain characteristics in their steers c, partly because of their steers acquiring certain chaeacteristics d, partly because certain characteristics should be acquired by their steers e, partly to acquire certain characteristics in their steers 答案选e,但我选的是d,虽然d是比较awkward and illogical.但同时觉得e与另一个原因不平行,错得更多,为什么选e呢,   
谢谢 |