经过点P（4，-2）的抛物线的标准方程为 [ ] A.y2=-8x B.x2=-

Stanford opened its doors in 1891 and more than a century later, it remains _____finding solutions to the great challenges of the day and to _______ its students for leadership in today’s complex world.

A．devoted, prepare

B．dedicated to, preparing

C．dedicating, prepare

D．devoting to, preparing

3和11没有最大公因数．______． （判断对错）

Do you know the ______ between them?[ ]

A. difference

B. different

C. difficult  

D. difficulty

世界上最好的红葡萄酒产自于德国莱茵地区。