若函数y=﹣3x^m﹣4+3是二次函数，则m=____ 

____ 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.

河北省境内的明长城，东起山海关的____，西到怀安县____河口，长约____千米，是我国古代劳动人民智慧的结晶。

质量如下，则下列说法中错误的是（   ）

小周同学在探究“凸透镜成像规律”实验时，在光屏上得到清晰的与烛焰等大的像（如图）。保持凸透镜位置不变，为了在光屏上得到清晰的缩小的像，他必须