— Dad, can you meet my demand        I        a chance to travel to Beijing?

— Unless you will get an A in the final exam.   [ ]

A. as; will be given              

B. what; should be given  

C. that; be given             

D. that; might be given

如图圆环上带有大量的负电荷，当圆环沿顺时针方向转动时，a、b、c三枚小磁针都要发生转动，以下说法正确的是（　　）

A．a、b、c的N极都向纸里转

B．b的N极向纸外转，而a、c的N极向纸里转]

C．b、c的N极都向纸里转，而a的N极向纸外转

D．b的N极向纸里转，而a、c的N极向纸外转