Janet as well as the other young people who ________ sent abroad by the government _______ brought up in a small town.

A．was; was

B．was; were

C．were; were

D．were; was

“嫦娥二号”卫星发射时，长征三号丙火箭直接将卫星由绕地轨道送入200～38×10⁴ km的椭圆奔月轨道，减少了多次变轨麻烦，及早进入绕月圆形轨道，则在“嫦娥奔月”过程中[ ]

A.离开地球时，地球的万有引力对卫星做负功，重力势能增加；接近月球时月球引力做正功，引力势能减小

B．开始在200 km近地点时，卫星有最大动能

C．在进入不同高度的绕月轨道时，离月球越近，运动的线速度越大，角速度越小

D．在某个绕月圆形轨道上，如果发现卫星高度偏高，可以通过向前加速实现纠偏