六大板块包括:中国板块、太平洋板块、印度洋板块、美洲板块、非洲板块和南极洲板块.

In preparation for the 2014 Nanjing Youth Olympic Games, our government has ________ a series of

measures to improve the city's air quality.[ ]

A. set out     

B. set aside

C. set down  

D. set up