Nowadays we take exercise a day as we need because of widely used automobiles.A. less than

问题补充：

Nowadays we take exercise a day as we need because of widely used automobiles.

A. less than half

B. less than as half as

C. less than half as much

D. half less than

答案：

A. less than half

B. less than as half as

(答案→)C. less than half as much

D. half less than

解析：句意：现在因为广泛使用汽车，我们一天的锻炼不到需要的一半。这里使用的是倍数的表达法：倍数+as+adj+as，这里half就是倍数，less than是修饰half的，所以放在前面，因为横线后面有as了，所以用as much，选C。