抛掷甲、乙两颗骰子,若事件A:“甲骰子的点数大于4”;事件B:“甲、乙两骰子的点数之和等于7”,则P(B|A)的值等于 ( )
A:13
B:118
C:16
D:19
如图,⊙O的半径为5,AB为⊙O的弦,OC⊥AB于点C.若OC=3,则AB的长为( )
把正确答语前的字母填到横线上
①6How many birds do you see?____
②I'd like car 18,please.____
③What's this?____
④How many balls do you have?____
a. I have 11. b. OK c. My new crayons d. I see 15.