如图,△ABC是⊙O的内接三角形,AC是⊙O的直径,∠C=50°,∠ABC的平分线BD交⊙O于点D,则∠BAD的度数是()
A:45°
B:85°
C:90°
D:95°
在下列物态变化过程中,属于放热的是( )
有关我国未成年人的根本法律是《____》。
--- Do we have to finish our homework this afternoon?
--- Yes, you .
---Our teacher is always kind.
---Yes. When she asked me to answer her question yesterday, I gave a wrong answer at first. She _______me to try again.
For years,scientists have been worried about the ________ of air pollution on the earth's natural conditions. ( )