问题补充：
Population experts say that by 2050 the world will have about 2 billion people aged over 60,as today.
A. as three times
Bthree times as many
Cthree times many
Dthree times many as
答案：
A. as three times
(答案→)B. three times as many
C. three times many
D. three times many as
解析：考察倍数表达法。倍数表达法：A be 倍数 as adj/adv的原级 as B;故B正确。句意：人口专家说在2050年世界上将有20亿60岁以上的人口，是现在的3倍。
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