Everybody in my class ________ a new club this term.
A:join
B:joins
C:joining
D:to join
He works at a o____.
已知:如图,l∥m,等边△ABC的顶点B在直线m上,边BC与直线m所夹锐角为20°,则∠α的度数为( )
下列动物中体温恒定的是( )
已知xa=2,xb=3,则x3a﹣2b=( )