某学校学生的平均年龄为15岁，标准差为2岁;该学校老师的平均年龄为30岁，标准差为3

发布时间：2017-06-27 05:19 │ 来源：www.tikuol.com

题型：单项选择题

问题：

某学校学生的平均年龄为15岁，标准差为2岁;该学校老师的平均年龄为30岁，标准差为3岁。比较该学校年龄的离散程度，则()。

A.教师年龄的离散程度大一些

B.学生年龄的离散程度大一些

C.学生年龄和教师年龄的离散程度相同

D.教师年龄的离散程度是学生年龄离散程度的1.5倍

考点：中级经济基础知识数据特征的测度数据特征的测度题库

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已知函数f（x）=

-x-1(-1≤x＜0)

-x+1(0＜x≤1)

，则f（x）-f（-x）＞-1的解集为______．

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A.办理收养公证

B.订立收养协议

C.订立收养协议并办理公证

D.进行收养登记

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完形填空。
The Pecan Thief When I was six years old, I was visiting my grandfather's farm in Kansas. Grandpa had sent me into the __1__ to gather pecans for us to enjoy later. Pecan picking was really __2__ work and my little basket was only half full. I wasn't about to __3__ Grandpa down. Just then something caught my __4__. A large brown squirrel was a few feet away. I watched as he picked up a pecan, hurried to a tree and __5__ in a large hole in the trunk. A moment later the squirrel __6__ out and climbed down to the ground to pick up another nut. Once again, he took the pecan back to his hiding place. Not so __7__ anymore, I thought. I dashed over to the tree and looked into the hole. It was __8__ with pecans! Golden pecans were right there for taking. This was my __9__. Handful by handful, I scooped all of those pecans into my basket. Now it was full! I was so __10__ of myself. I couldn't wait to show Grandpa all the pecans. __11__, I ran back and shouted, "Look at all the pecans!" He looked into the basket and said, "Well, well, how did you find so many?" I told him how I'd __12__ the squirrel and taken the pecans from his hiding place. Grandpa congratulated me on how smart I'd been in observing the squirrel and his habits. Then he did something that __13__ me. He handed the basket back to me and put his arm gently __14__ my shoulders. "That squirrel worked very hard to gather his winter __15__ of food," he said. "Now that all of his pecans are gone, don't you think that little squirrel will __16__ the cold winter?" "I didn't think about that," I said. "I know," Grandpa said. "But a good man should never take __27__ of someone else's hard work." Suddenly I felt a bit __18__. The image of the starving squirrel wouldn't __19__ my mind. There was only one thing I could do. I carried the basket back to the tree and poured all the nuts into the hole. I didn't eat any pecans that night, but I had something much more filling-the __20__ of knowing I had done just the right thing.
( )1.A.rooms ( )2.A.hard ( )3.A.let ( )4.A.sweater ( )5.A.joined ( )6.A.jumped ( )7.A.strange ( )8.A.covered ( )9.A.time ( )10.A.afraid ( )11.A.Otherwise ( )12.A.driven ( )13.A.annoyed ( )14.A.off ( )15.A.supply ( )16.A.escape ( )17.A.place ( )18.A.guilty ( )19.A.open ( )20.A.inspiration	B. woods B. dirty B. settle B. basket B. lived B. held B. secret B. filled B. choice B. ashamed B. However B. followed B. satisfie B. beside B. cost B. spend B. notice B. unconfident B. leave B. expectation	C. holes C. light C. have C. eye C. discovered C. stood C. anxious C. rebuilt C. chance C. careful C. Besides C. protected C. surprised C. over C. support C. survive C. advantage C. embarrassed C. cross C. impression	D. roads D. easy D. keep D. hand D. disappeared D. found D. patient D. decorated D. achievement D. Proud D. Therefore D. caught D. delighted D. around D. preparation D. flee D. charge D. nervous D. occupy D. satisfaction

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男性，65岁。风湿性心脏病左房室瓣（二尖瓣）狭窄15年，体外循环瓣膜置换术后6h，呼吸机辅助呼吸，吸入FiO₂75%，病人烦躁，PaO₂75kPa，心率100次/分，血压14/10kPa（105/75mmHg）。

此时考虑病情应是（）

A.休克

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D.肺栓塞

E.MODS

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