A:m<x<
B:x=i
C:n<x<i
D:x>i
已知α为一锐角,且cosα=sin60°,则α=____ 度
——She's seldom asked to do housework at home, she?—— . Her parents are very busy with their work, so she has to do the laundry every day.
—Oh. Mary's not here these days. Is she ill? —_____.Her mother told me that she was in hospital.