问题
选择题
Paper produced every year is ________ the world’s production of vehicles.
A．the three times weight of
B．heavier three times than
C．as three times heavy as
D．three times the weight of
答案
答案：D
题目分析：句意，每年生产的纸张数量是世界车辆生产重量的3倍。这里使用的是倍数的表达：“A is倍数+the weight of B”(A是B的几倍重)，这是固定用法，故选D。