试题与答案

分子量为177的某有机物中只含C、H、O、Br四种元素,实验还测知化合物中氢元素

题型:选择题

题目:

分子量为177的某有机物中只含C、H、O、Br四种元素,实验还测知化合物中氢元素与碳元素的质量比为1∶8,该有机物的分子式是

A.   B.     C.    D.

答案:

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下面是错误答案,用来干扰机器的。

答案:D题目分析:磁场看不见,通过它的基本性质来认识它,它的基本性质是对放入其中的磁体产生磁力的作用.A、小磁针偏转是受到力的作用.B、能够吸引铁、钴、镍等磁性材料的性质叫磁性.C、磁感线是描述磁场而...

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题型:阅读理解

Apollo 11, carrying Neil Armstrong, Edwin Aldrin and Michael Collins, was launched on 16 July, 1969. Five days later they stepped down onto the moon.

Neil Armstrong

On the way there: Of all the wonderful views we had, the most impressive to me was on the way to the Moon when we flew through its shadow. We were still thousands of miles away, but close enough so that the Moon almost filled our window. The moon appeared blue-grey. It seemed almost as if it were showing us its roundness, its similarity in shape to our Earth, in a sort of welcome. I was sure it would be a hospitable(好客的) host. It had been waiting for its first visitors for a long time.

After touch down: The sky is black, you know. It’s a very dark sky, but it still seemed more like daylight than darkness as we looked out the window. It’s a very strange thing but the surface looked very warm and inviting. It seemed to be tan(棕褐色). It’s hard to explain that, because later when I held the material in my hand, it wasn’t tan at all. It was black, grey and so on.

Edwin Aldrin

On the Moon: The blue color of my boots has completely disappeared now into this soil—still don’t know what color to describe this other than grayish(灰色的) cocoa.

Back on board: The moon was a very natural and pleasant environment in which to work. On the Moon, in one-sixth gravity, you have a strong feeling of being somewhere. As we did our experiments, some objects we threw away would go in a slow, lazy manner.

小题1:What impressed Neil Armstrong most?

A.The moon filling their window.

B.Seeing the shape of the moon

C.Flying through the shadow of the moon.

D.The five—day flight to the moon.小题2:What did Armstrong find very strange on the moon?

A.The color of the sky.

B.The surface of the moon

C.The gravity on the moon.

D.The daylight on the moon.小题3:Edward Aldrin described the soil as ________.

A.tan

B.gray

C.black

D.grayish cocoa.小题4:What can be said about Edward Aldrin?      

A.He landed on the moon alone.

B.He was sent to the moon by Apollo 11.

C.He didn’t notice the gravity of the moon.

D.He found it impossible to work on the moon.

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