问去年十月的JJ

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... .
选哪个呀？

20．Although historians [ 知道XXX的存在]，
画线开始{it is believed that ... remains of one - a woman... -, to} 画线结束 have been excavated...
画线开始{... remains of them - a woman... -, } 画线结束 have been excavated...
画线开始{... remains of one - a woman... -, } 画线结束 have been excavated...
画线开始{ there is ... remains of one - a woman... -,} 画线结束 have been excavated...

21．同位语部分(- a woman ...-) 在各选项基本一样。看来选对了，下一个SC more difficult.

第一题A 平行结构，如果题目没抄错的话。As 这里表达列举的意思，不能单独带从句。

第二题不知道，推测一下

同位语是a woman，前面部分名词 remains of one(them) 核心词是remains。也就是说remains等于a woman. a woman不可能再of one了，只能是of them. 所以推测是B项正确。