问题 选择题
若椭圆
x2
16
+
y2
25
=1
上一点P到焦点F1的距离为6,则点P到另一个焦点F2的距离为(  )
A.2B.4C.6D.8
答案

∵椭圆的方程为

x2
16
+
y2
25
=1,

∴该椭圆的焦点在y轴上,a2=25且b2=16,可得a=5、b=4.

根据椭圆的定义,得|PF1|+|PF2|=2a=10

∵椭圆上一点P到焦点F1的距离|PF1|=6,

∴点P到另一个焦点F2的距离|PF2|=2a-|PF1|=10-6=4.

故选:B

选择题
完形填空

It was pouring outside. We all stood there  16 , some patiently, others annoyed  17  nature messed up their hurried day. I got lost in the sound and sight of the heavens  18  away the dirt and dust of the world.

“Mom, let’s run through the rain.” a girl’s voice  19 me.

“No, honey. We’ll wait until it  20  down a bit.” Mom replied.

The young girl waited about another minute and  21 : “Mom, let’s run through the rain.”

“We’ll get wet if we do,” Mom said.

“No. we won’t, Mom. That’s not what you said this morning,” the young girl said as she  22  her Mom’s arm.

“This morning?  23 __ did I say we could run through the rain and not get wet?”

“Don’t you remember? When you were talking to Daddy about his cancer, you said, ‘If God can get us through this, he can get us through  24 .’”

The entire crowd turned   25 . Mom paused and thought for a moment about  26  she would say.

Now some would laugh it off and scold her for being  27 . But then we heard, “Honey, you are  28 . Let’s run through the rain. If we get wet, maybe we just need washing,” Mom said. Then  29  they ran.

We all stood  30__ , smiling and laughing as they ran past the cars. Yes, they got wet. But they were  31  by a few who screamed and laughed like children all the  32  to their cars. Circumstances or people can take away your material possessions, and they can even take away your  33  . But no one can ever take away your precious  34 . So, don’t forget to make time and take the  35  to make memories every day! I hope you still take the time to run though the rain.

16. A. talking                   B. waiting             C. complaining          D. expecting

17. A. as if                B. even if            C. because            D. when

18. A. taking              B. putting           C. driving            D. washing

19. A. caught             B. annoyed          C. impressed          D. called

20. A. slows              B. comes              C. pushes             D. stops

21. A. asked              B. repeated           C. required           D. added

22. A. pulled              B. touched          C. waved             D. felt

23. A. Why               B. How               C. When             D. Where

24. A. the rain            B. the disease      C. anything          D. something

25. A. still                B. silent             C. serious             D. angry

26. A. what              B. how                      C. whether            D. if

27. A. dishonest           B. silly                      C. daring             D. forgetful

28. A. right               B. wrong            C. stupid            D. clever

29. A. off                B. along             C. on                D. over

30. A. sighing             B. joking             C. discussing         D. watching

31. A. followed           B. guided                 C. respected           D. praised

32. A. time                     B. way                C. same               D. best

33. A. house              B. money            C. health            D. time

34. A. children            B. memories        C. courage           D. experience

35. A. possibilities         B. opportunities   C. risk              D. challenge