嫦娥一号”探月卫星发动机关闭，轨道控制结束，卫星进入地月转移轨道，图中MN之间的一段曲线表示转移轨道的一部分，P是轨道上的一点，直线AB过P点且和两边轨道相切，下列说法中正确的是

A．卫星在此段轨道上，动能不变

B．卫星经过P点时动能最小

C．卫星经过P点时速度方向由P指向B

D．卫星经过P点时加速度为0

North of Boston is described by the author, Robert Frost, as "a book of people," which shows a brilliant insight into ______ character and the background that formed it.

A. the cowboy



B. New England
C. Ivy League



D. ivory tower