— Dad, why must I stop computer games?
—For your health, my boy.
A:play
B:to play
C:to playing
D:playing
⑴This is a photo of Hainan. ____
⑵I got to school by car yesterday.____
⑶Beijing is in the north of China.____
⑷The mountains are really beautiful.____
⑸I went to England last year.____
— Twice a week.
如图是探究影响电磁铁磁性强弱因素的实验,下列说法正确的是( )