在用射线法进行点与多边形之间的包含性检测时，下述操作不正确是（）
A.当射线与多边形交于某顶点时且该点的两个邻边在射线的一侧时，计数0次
B.当射线与多边形交于某顶点时且该点的两个邻边在射线的一侧时，计数2次
C.当射线与多边形交于某顶点时且该点的两个邻边在射线的两侧时，计数1次
D.当射线与多边形的某边重合时，计数1次
参考答案：A, B, C
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| Many Chinese students don't pay much attention to spoken English at school. They think it necessary to practice 1 English in class, but not 2 class. Here is a story to show you 3 important it is to speak the English language freely in everyday life. A foreigner once 4 hungry and went into a restaurant in London. He sat down at a table. When the waiter came, he 5 his mouth, put his fingers into it and took them out again in order to 6 that he wanted something 7 because he could not speak English. The waiter soon 8 him a cup of tea. The man shook his head. The waiter then took 9 the tea and gave him a cup of coffee. Still the man didn't 10 what he wanted. He tried again and again, but he wasn't able to make the waiter 11 him. Finally 12 man came in. He spoke English 13 and fluently. After a few minutes, there was a large plate of meat and vegetables on the table in front of 14 . So you see a man can go hungry if he 15 master (掌握) a foreign language. | |||
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