—I think students should have mobile phones to call their parents.
— . They often use them to play games instead.
A:I hope so
B:I don't agree
C:Good idea
如图,MN是⊙O的直径,MN=8,∠AMN=20°,点B为弧 AN^ 的中点,点P是直径MN上的一个动点,则PA+PB的最小值为____.
一年中有两次太阳直射现象且全年昼夜等长的是( )
—Believe it or not, I saw a UFO just now!