题干
—Hi, Daniel. How was your trip to Qingdao?
—________. The beaches there are very beautiful and we also enjoyed some fresh seafood.
A：Not badly
B：Very much
C：Very good
D：So well
答案(点此获取答案解析）
C
：
和圆
:
，其中
，直线
经过
四点，则
的值为 （ ）