已知双曲线 C:x2−y2b2=1(b>0) 的左、右焦点分别为 F1,F2 ，点 P 是双曲线 C 上的任意一点，过点 P 作双曲线 C 的两条渐近线的平行线，分别与两条渐近线交于 A,B 两_刷题宝

题干

已知双曲线 C:x2−

y

2

b

2

=1(b>0) 的左、右焦点分别为 F1,F2 ，点 P 是双曲线 C 上的任意一点，过点 P 作双曲线 C 的两条渐近线的平行线，分别与两条渐近线交于 A,B 两点，若四边形 PAOB （ O 为坐标原点）的面积为 2 ，且 PF1⇀⋅PF2⇀>0 ，则点 P 的横坐标的取值范围为（）

A： $(- \infty, - \frac{\sqrt{17}}{3}) \cup^{} (\frac{\sqrt{17}}{3}, + \infty)$

B： $(- \frac{\sqrt{17}}{3}, \frac{\sqrt{17}}{3})$

C： $(- \infty, - \frac{2 \sqrt{17}}{3}) \cup^{} (\frac{2 \sqrt{17}}{3}, + \infty)$

D： $(- \frac{2 \sqrt{17}}{3}, \frac{2 \sqrt{17}}{3})$

上一题下一题 0.0难度选择题更新时间:2019-03-13 05:52:25

答案(点此获取答案解析）

A

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下列说法中，正确的是（　　）

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如图，在□ABCD中，已知∠ODA＝90°，AC＝10cm，BD＝6cm，则BC的长为（）

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（C）

Jim went to school to study history, but when he finished his first year, he didn't pass the exam and the teacher said to him, “You have to leave school.”

When the boy's father heard this news, he was much worried. He came to the school to see the teacher. He found the teacher in the office and asked the teacher to let Jim go on with his studies the next year.

“He is a good boy. He always does well in history,” said Jim's father, “and if you let him pass the exam this time, he will do better next year and pass the exam.”

“No, no, that's impossible!”answered the teacher, “Last month I asked him when Napoleon（拿破仑）died and he didn't know.”

“Please sir, give him another chance.”said Jim's father,“You know we don't have any newspapers in our house, so nobody in our family knew that Mr. Napoleon was ill.”

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阅读文言语段《画蛇添足》，完成下列小题。

楚有祠者^①，赐其舍人^②卮^③酒。舍人相谓曰：“数人饮之不足，一人饮之有余。请画地为蛇，先成者饮酒。”一人蛇先成，引酒且饮之，乃左手持卮，右手画蛇，曰：“吾能为之足。”未成，一人之蛇成，夺其卮曰：“蛇固无足，子安能为之足？”遂饮其酒。

为蛇足者，终亡其酒。

【注】①祠者：主管祭祀的官员。②舍人：门客，手下办事的人。③卮（zhī）：古代装酒具。

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