[求助]10月JJ 17

shazhi

17．还有一道sc
a)These days many places are facing pollution problems: some places are..., some places are .... and some places are... .   
b)These days many places are facing pollution problems as some places are..., some places are .... and some places are... .

考的是as 和冒号， 省略号里是说某些地方被什么污染等等。


请教，as 和冒号用法有什么不同？

gemj

as 不能用作举例，要用也应该是SUCH AS.