如图,已知∠1=∠2,∠3=100°,则∠4=____.
已知直线l垂直平面a,垂足为O.在矩形ABCD中AD=1,AB=2,若点A在l上移动,点 B在平面a上移动,则O、D两点间的最大距离为( )
选择 方框中的单词并用其适当形式填空。
story,or,but,talk,write
I think these ____are very interesting.
He can’t play the piano ____ the guitar.
Can Tony ____stories?
Th e students are ____ to each other now.
Tina can speak English ____ she can’t speak Chinese.
第一段说明了人被老虎吃掉的原因是什么?