就要考试了，再请教几道题

congcongdog

1、Jazz music may be either improvised and written, but most jazz sonsists at least in part of improvisation.

in part of 如何解释？

2、The earliest records of mathematic show it arising in response to practical needs in business, industrial, and agriculture.

it arising 为什么是正确的？

3、Allotropes are the individual form of an element that occur when more than one type of bonding between atoms of the element is possible.

more that one type 用单数谓语吗？

请大家指教，谢谢！

FYI：以上题目来自ETS《托福历年全真试题》第三套

brace

恳请楼主下载语法大全， 搜索出题目编号再提问。 http://forum.chasedream.com/dispbbs.asp?boardID=58&ID=76640&page=1

congcongdog

语法大全我下载过了，不过这些题是上面没有的。是ETS新推出的。

麻烦大家了！