题干
—________is your T-shirt?
—It's 80 yuan.
A：How many
B：How big
C：How much
D：How old
答案(点此获取答案解析）
C
—________is your T-shirt?
—It's 80 yuan.
A：How many
B：How big
C：How much
D：How old
=0.5。不计空气阻力，g=10m/s2，sin37°=0.6，cos37°=0.8，求：