12世纪末居住在蒙古高原上的部落，依[蒙古秘史]及[史集]所著录的统计，差不多近（）个。
参考答案：100
成人骨质内有机物约占2/3，无机物约占1/3
The chairwoman had her office ______ during her absence, which she’d like to see ______ the following day.
A．broken into; looked into
B．broken out; looking into
C．broken in; look into
D．broken off; to look into
