问题
选择题
Population experts say that by 2050 the world will have about 2 billion people aged over 60,____as today.
A．as three times
B． three times as many
C． three times many
D． three times many as
答案
答案：B
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。