Question

As a recent survey states, people can hardly enjoy a clear blue sky        because of the high level of PM 2.5.

A．in trouble

B．on purpose

C．as usual

D．in ruins

Answer 1

C

试题分析：A. in trouble有困难，B. on purpose故意地，C. as usual像平常一样，D. in ruins成为废墟，句意：正如最近 的调查表明的，人们几乎不能象平常一样享受清澈的蓝天，因为PM2.5的高水平。选C。