Meanwhile, the weights of the surviving rat pups were also lower. Since the amount of the pups was smaller, about half, more milk should have been ( ) for the individual pups.
A.negative B.available C.survival D.productive正确答案B
Meanwhile, the weights of the surviving rat pups were also lower. Since the amount of the pups was smaller, about half, more milk should have been ( ) for the individual pups.
A.negative B.available C.survival D.productive正确答案B
