
答案:(b)
If a human fetus were to grow throughout a pregnancy at the rate of between the fourth and eighth week, the baby would weigh over fourteen tons at birth.
(a)were to grow throughout a pregnancy at the rate of between the fourth and eighth week
(b)were to grow throughout a pregnancy at the rate at which it grows between the fourth and eighth weeks
(c)were to grow throughout a pregnancy at the rate of the fourth and eighth weeks
(d)should grow at the rate of weeks four to eight throughout a pregnancy
(e)should grow at the same rate that it grew between the fourth and eighth week throughout a pregnancy