问题 单项选择题

在回归模型?=β0+β1+ε中,ε反映的是()。

A.由于x的变化引起的y的线性变化部分

B.由于y的变化引起的x的线性变化部分

C.除x和y的线性关系之外的随机因素对y的影响

D.由于x和y的线性关系对y的影响

答案

参考答案:C

阅读理解

“I Went Skydiving at 84!”

As a young girl growing up in the 1930s, I always wanted to fly a plane, but back then it was almost unheard of a woman to do that. I got a taste of that dream in 2011,when my husband arranged for me me ride in a hot air balloon for my birthday. But the experience turned out to be very dull. Around that time ,I told my husband that I wanted to skydive. So when our retirement community(社区)announced that they were having an essay competition and the topic was an experience of a lifetime that you wanted to have, I decided to write about my dream.

In the essay, I wrote about my desire to skydive, stating George Brush Sr. did it at age 80. Why not me? I was just 84 and in pretty good health. A year went by and I heard nothing. But then at a community party in late April 2009, they announced that I was one of the winners. I just couldn’t believe it.

One june 11, 2009, nearly 40 of my family and friends gathered in the area close to where I would land while I headed up in the airplane. My instructor, Jay, guided me through the experience. The plane was the noisiest one I had ever been in, but I wasn’t frightened—I was really just looking forward to the experience. When we reachen 13,000 feet, Jay instructed me to throw myself out of the plane. When we first hit the air, the wind was so strong that I could hardly breathe. For a second I thought, “What have I gotten myself into?” But then everything got calmer. We were in a free fall for about a minute before Jay opened the parachute(降落伞), then we just floated downward fo zhout five minutes. Being up in the clouds and looking at the view below was unlike anything I have ever felt—much better than the hot air ballon. I was just enjoying it.

Skydiving was really one of the greatest experiences of my life. I hope other people will look at me and realize that you don’t stop living just because you are 84 years old. If there’s something you want to experience, look into it. If it’s something that is possible, make it happen.

小题1:

What happened to the auther in 2001?

A.She flew an airplane

B.She entered a competition

C.She went on a hot air balloon ride

D.She moved into a retirement community小题2:

The author mentioned George Bush Sr. in her essay to       .

A.build up her own reputation

B.show her admiration for him

C.compare their health conditon

D.make her argument persuasive小题3:

How did the authou feel immediately after she jumped out of the plane?

A.Excited

B.Scared

C.Nervous

D.Regretful小题4:

What did the author enjoy most when she was skydiving?

A.The beautiful clouds

B.The wonderful view

C.The company of Jay

D.The one-minute free fall

综合

(26分)阅读材料,回答下列问题。

材料一 天然橡胶是一种热带经济作物,是制造轮胎的原料。天然橡胶喜高温、高湿:年均温在19℃以上,以21~27℃为宜;年降水量1000~1500毫米,相对湿度70~80%;静风向阳,风速<3米/秒。肥沃深厚的土壤:土层厚度>60厘米。热量条件的保证程度,特别是越冬低温状况是橡胶树生长的限制因素。绝对低温<5℃,就会引起寒害;绝对低温<0℃,引起严重寒害,时间较长则引起死亡。西双版纳地区是我国重要的天然橡胶基地。

材料二 哀牢山脉宛若一道屏障纵贯云南中部,在云南气候上有着重要作用。哀牢山西坡水热条件较东坡优越。

材料三 我国天然橡胶分布图

材料四 印度尼西亚是居泰国之后的世界第二大天然橡胶生产国,是世界上天然橡胶种植面积最大的国家。2010年12月23日,全球第七大轮胎生产制造商——韩泰轮胎公布了在印度尼西亚雅加达东部贝克西地区投资3.53亿美元新建轮胎工厂的计划。

(1)我国天然橡胶主要分布在北回归线以南地区,试从气候方面解释其原因。(6分)

(2)哀牢山西坡的橡胶林多选择在阳坡的山腰部位,并放宽行距;哀牢山东坡地区,橡胶林则选择在北部有屏障且向南开阔的马蹄形环境中,并且要预先营造防护林。分析橡胶林如此布局的原因。(12分)

(3)简述在印度尼西亚建设轮胎厂的优势区位条件。(8分)