A:《诗经》
B:《论语》
C:《道德经》
D:《韩非子》
读一读,把正确答案代码填入相应的括号里。
① What can you do?____ A. I need a new dress.
② What can she do?____ B. I can ride a bicycle.
③ What can he do?____ C. She can fly a kite.
④ What do you need?____ D. He can play football.
读经纬网图,回答下列问题。
已知椭圆x2a2+y2b2=1a>b>0的离心率e=12,右焦点为Fc,0,方程ax2+bx-c=0的两个实根x1,x2,则点Px1,x2( )