正方形是轴对称图形，它的对称轴有（ ）
八十亿七千五百万写作____, 改写成以万为单位的数是____．
给下列问句选择合适的答语。
A. I'm 46 kilograms.
B. I'm 12 years old.
C. It's 5 tons.
D. Size 8．
E. I'm 1.64 metres.
① —What size are your shoes?
—____
② —How heavy are you?
③ —How tall are you?
④ —How old are you?
⑤ —How heavy is it?
