英语四级单选,To be living at the sart of the new millennium is ___

英语四级单选,
To be living at the sart of the new millennium is ____in the most advanced technological era in history.
A.existing B.being existed C.to be existed D.to exist
Male and female students are quite different from each other____the age at which they begin to develop an intellectual self-discipline.
A.with regard to B.in the light C.in proportion to D.on account of
需要汉语翻译