To meet the rapidly rising market demand for fish and seafood, suppliers are
growing fish twice as fast as "their natural growth rate, cutting their feed
allotment" by nearly half and raising them on special diets.
(A) their natural growth rate, cutting their feed allotment
(B) their natural growth rate, their feed allotment cut
(C) growing them naturally, cutting their feed allotment
(D) they grow naturally, cutting their feed allotment
(E) they grow naturally, with their feed allotment cut
本题答案是D 意思为供应商应商养鱼的速度是(鱼类)牠们在自然环境成长的两倍速
但通常 "倍数 + as fast as ..." 是指
"同一件动作" 但是两个不同速度的"相同动作"
照这样的解释的话 本句句意变成"喂养"的速度，是"成长"的速度的两倍.
但不同动作可以互相比度吗?
请问本句话这样写对吗? 还是我哪里理解有误?
谢谢