脑型血吸虫主要分布地域在()
A.长江中下游和南方水网地带
B.东北平原
C.西北地区
D.西南山岭地区
E.南方海岛区域
参考答案:A
“不在同一直线上的三点确定一个圆”。请你判断平面直角坐标系内的三个点A(2,7),B(-3,-9),C(5,11)是否可以确定一个圆。请写出你的推理过程。
— Hi, David! How was your trip to Beijing?
— Wonderful! I had never had ________ holiday in my life. [ ]
A. a most exciting
B. a more exciting
C. the most excited
D. the more excited