如图所示，平行板电容器的电容为C，带电荷量为Q，板间距离为d，今在两板的中点处放一电荷q，则它所受电场力的大小为（ ）
--- You’d better _______ some popcorn or soft drinks before the film begins.--- But I think it’s better _______ anything while watching the film.
— I don’t like watching documentaries because they are boring. — _______ .
The little boy likes staying with his grandmother because she can always_ __________new stories for him.
--What do you think of the music in the film Crouching Tiger, Hidden Dragon?--_______. The composer won an Oscar for the music.
--How much difficulty did Lucy have_______ this problem?--_______. She's a good problem solver.
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