2的倒数为（ ）
A：12
B：2
C：-2
D：-12
载人飞船在太空运行，航天员坐在飞船的座舱内，相对下列哪个物体航天员是静止的（ ）
As you are not feeling well, you'd better_______ to school.
——Millie, where is Miss Li?——She a speech on Chinese art to the first-year students in the hall.
