题干
祖冲之最杰出的贡献是（ ）
A：最早提出了圆周率的正确计算方法
B：在世界上第一次把圆周率精确到小数点后的第七位数字
C：编成《缀术》
D：精密地观测行星运行情况
答案(点此获取答案解析）
B
⑴When do you eat breakfast?
A.It's warm and sunny.
⑵Can you make a snowman now?
B.No,it isn't.
⑶What's the weather like today?
C.I eat breakfast at 7: 15.
⑷What would you like to do?
D.No,I can't.
⑸Is it windy and cold?
E.I would like to go swimming.