问题补充：
Nowadays people take exercise a day as they did in the past 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：考查倍数问题。此题结构为：倍数+ as+ adj./adv.原级 + as。句意：因由于汽车的广泛使用，现在人们花不到和以前一样的一半时间运动
