单项选择题

By 2050 the world will have about 2 billion people aged over 60, three times （） today.

A．as much as
B．as that of
C．as many as
D．as those of

相关考题

He added that the state government has made （） arrangem...

单项选择题He added that the state government has made （） arrangements for the conference.

A．accurate
B．absolute
C．adequate
D．active