Kate is very ________. She likes to stay at home and read books.
A:funny
B:quiet
C:outgoing
D:serious
如图,已知a∥b,∠1=46°,则∠2等于=____.
汽车上坡时,驾驶员要换成低档,以减小汽车的行驶速度,这样做的目的是( )