A:①②
B:①③
C:②④
D:③④
Did you _____ the clothes? ( )
世界上储量最大、出产和输出最多石油最多的地区是( )。
如图所示,已知x2a2+y2b2=1(a>>0)点A(1,2)是离心率为22的椭圆C:上的一点,斜率为2的直线BD交椭圆C于B、D两点,且A、B、D三点不重合.
(Ⅰ)求椭圆C的方程;
(Ⅱ)求△ABD面积的最大值;
(Ⅲ)设直线AB、AD的斜率分别为k1,k2,试问:是否存在实数λ,使得k1+λk2=0成立?若存在,求出λ的值;否则说明理由.
⑴How can you get to the school ?____
⑵Happy birthday !____
⑶What's the weather like in summer ?____
⑷May I speak to Mike ?____
⑸Where is your aunt from ?____
A、It's cold .
B、Shenzhen .
C、Thank you .
D、Take bus No.4 .
E、Yes , speaking .