90°-23°39′="_______" 176°52′÷3=______
主要考察度分秒之间的转换，他们之间是六十进制，即：，
------______, is the seat free?
------______, it’s taken. My friend will be back soon.
A．I’m sorry; I apologize
B．I beg your pardon; I’m afraid
C．Good morning; Oh, that’s right.
D．Excuse me; Sorry
卵圆窝：
，
，