47 What is the main idea of this passage?
(A)The ratio of the brain size relative to the body size of an animal is a good measure of intelligence.
(B)The number of neurons is an absolute measure of an animal’s intelligence, be it a plant eater or a meat eater.
(C)The number of neurons reveals that plant eaters are generally smarter than meat eaters.
(D)The ratio of the number of neurons relative to the size of an animal’s body can indicate how smart the animal is.

1. What is the main idea of this passage?
   這篇文章的主要思想是什麼？

(A) The ratio of the brain size relative to the body size of an animal is a good measure of intelligence.
動物腦部大小與身體大小的比例是衡量智力的好方法。

(B) The number of neurons is an absolute measure of an animal’s intelligence, be it a plant eater or a meat eater.
神經元的數量是衡量動物智力的絕對標準，無論是草食動物還是肉食動物。

(C) The number of neurons reveals that plant eaters are generally smarter than meat eaters.
神經元數量顯示草食動物通常比肉食動物更聰明。

(D) The ratio of the number of neurons relative to the size of an animal’s body can indicate how smart the animal is.
神經元數量與動物身體大小的比例可以顯示動物的聰明程度。