30、

collaborating…Achallenge B, and B is proved negative。
  cooperating ……想不起来了，再回忆回忆

by 冬日旅馆

31、

考点：todo sth is to do sth （迷惑选项有to do sth is doing sth; to do sth is n; todo sth means sth）

By DexJ

32、

考点：sbagree that…, and that…

By DexJ

33、

分别是“分号/破折号/逗号+解释的内容”

解释：

因为SC很可能因为细节不准确而产生误导，所以只说了考点。我努力回忆了一下，此题考点两个（1）对前面完整结构的解释；（2）后面的并列。（下面的细节不保证对，但是这个意思）

【A】(一个完整的主谓宾结构：大意说艺术兴起)—the presence of a great number of art works in churches and museums, as well as a sophisticated art market. (我选这个)

【B】(完整结构)；the presence of a great number of art works in churches, museums；as well as a sophisticated art market. (注意有两个分号）

【C】(完整结构), the presence of a great number of art works in churches, museums, and a sophisticated art market

By DexJ

34、

倒装加重语气的用法 - Only in ... , is there a ...

by allenwanghl