已知椭圆的长轴长是短轴长的$\sqrt{3}$倍，则椭圆的离心率等于(   )

一质点沿直线AD做匀加速直线运动，如图所示，测得它在AB、BC、CD段的运动时间相同且都为t，并测出AC段的位移是L₁，BD段的位移是L₂．试求质点运动的加速度大小．

____ We make         (玩具)in the factory for children from 1 to 5 years old.
____ Mr. Wang enjoys r         newspapers in the morning.
____ He is a police man .It's a             (危险的) job.
____ I think giraffes are good-looking, but lions are u__________ .
____  There is much ________ （雨）here in summer.
____ My mother is l_________ on the beach.
____ What s_________ skirt would Joe like?
____ He is from France. He speaks F________ .  
____ The park near my home is very d_________（脏）, I don't like to go there.
____ There are three            (小偷)in the police station.