国务院新闻办公室发表的《新疆的历史与发展》白皮书指出新疆与中原地区的密切联系由来已久。请你判断新疆地区正式归属我国中央 * * 管辖最早开始于(      )

A．张骞出使西域

B．西域都护的设置

C．玄奘西行

D．丝绸之路开通

The computer was used in teaching. As a result，not only _____，but students became more interested in the lessons.

A．saved was teachers’ energy

B．was teachers’ energy saved

C．teachers’ energy was saved

D．was saved teachers’ energy