给生字选择正确的读音。

参加（cān  sān）____     练习（liàn   làn）____    

比赛（sài   shài）____     冠军（guàn   guàng）____

A. Amy likes Christmas Day. She can get some gifts.

B. Oliver's favorite day is Mother's Day. He can help his mother.

C. Wu Yifan likes Teachers' Day. He will give flowers to teachers.

D. Zoom likes his birthday best. He can eat good food.

E. Robin likes New Year best. He can sing and play.

⑴ ____

⑵ ____

⑶ ____

⑷ ____

⑸ ____

（2013•鞍山） 如图所示，物体A所受重力为200N，绳重和摩擦力不计，当分别沿力F₁和F₂的方向匀速提起物体A时，则F₁____F₂（选填“大于”、“小于”或“等于”），若10s内A物体被匀速提升4m，则拉力F₁所做的功为____J，功率为____W，如果把这个滑轮改成动滑轮匀速竖直提升同样的重物，则机械效率将____（选填“增大”、“减小”或“不变”）．

经纬网定位

读图，写出下列各点的经纬度

A．____

B．____

C．____

D．____．