问题补充：
Paper produced every year is the world’s production of vehicles.
A. the three weight of
B. three times the weight of
C. as three times heavy as
D. three times as heavier as
答案：
A. the three weight of
(答案→)B. three times the weight of
C. as three times heavy as
D. three times as heavier as
解析：考查倍数被动法。倍数表达有四种：1. “A+倍数+形容词或副词的比较级+than+B”， 2.“A+倍数+as+形容词或副词的原级+as+B”， 3. “A+倍数+the size/height/length/width， etc+of+B”， 4. “……times+what+从句”。本题使用的是第3种结构。句意：每年生产的纸的重量是车辆的重量的三倍。故B正确。
