下列物质的用途,是利用其物理性质的是[ ] A.干冰用于人工降雨 B.盐酸用于除

题型:选择题

问题:

下列物质的用途,是利用其物理性质的是[ ]

A.干冰用于人工降雨

B.盐酸用于除铁锈

C.氧气用于医疗急救

D.熟石灰用于改良土壤酸性

考点:物理性质和化学性质的区别和应用
题型:选择题

全美保险监督官协会是由美国各州保险监督管理机构组成的,它属于()。

A.政府机构,有监督管理权

B.政府机构,无监督管理权

C.非政府机构,有监督管理权

D.非政府机构,无监督管理权

题型:选择题

“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

题型:选择题

子查询的SELECT语句不能定义联合查询或______。

题型:选择题

临时停车时,应做那些工作?

题型:选择题

对于某一整数规划可能涉及到的解题内容为()

A.求其松弛问题

B.在其松弛问题中增加一个约束方程

C.应用单形或图解法

D.割去部分非整数解

E.多次切割

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