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Once Wilhelm K. Roentgen and several other scientists were experimenting with passing electric currents through certain gases in a special glass tube from which the air had been taken away. Then one day Roentgen noticed that when the tube was covered with black paper, some strange kind of radiation was coming through and making a screen nearby glow(发光). Roentgen could see anything out of the tube, but then he discovered that if he put the screen at the next room on the other side of a closed door, the rays still seemed to affect it. The glowing screen showed that the rays could pass not only through the black paper but also through wood.

The next thing he found out was that if he put his hand between the rays and a photographic

plate, the rays would print a shadow of the bony(骨头的) framework of his hand on the plate. In fact, the rays could pass as easily through the fleshy part of his hand as through the black paper. But hardly at all through the bone. So Roentgen made the first X-ray picture of a hand showing just how the bones in the hand fitted together.

Roentgen called the unknown rays X-rays, but other scientists called them Roentgen rays in

Roentgen discovered X-rays ___________.

       A.by working hard             B.by chance

       C.by doing experiment after experiment    D.with the help of several other scientists

What was in the special glass tube?

       A.Air   B.Nothing    C.Nothing but gases    D.None of the above

We may conclude that the rays Roentgen found were __________.

       A.dangerous B.invisible   C.colorful    D.poisonous

What could X-rays hardly pass through?

       A.Wood       B.Glass C.Bones       D.Black paper

Which title best gives the main idea of the passage?

       A.the Discovery of Roentgen Rays.    B.The Discovery of Electric Currents.

       C.The First X-ray Picture of a Hand. D.The Use of the Photographic Plate.

【小题1】B

【小题2】D

【小题3】B

【小题4】C

【小题5】A


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  Once Wilhelm K.Roentgen and several other scientists were experimenting with passing electric currents through certain gases in a special glass tube from which the air had been taken away. Then one day Roentgen noticed that though when the tube was covered with black paper, some strange kinds of radiation was coming through and making a screen nearby glow. Roentgen could not see anything out of the tube, but then he discovered that if he put the screen in the next room on the other side of the closed door, the rays still seemed to affect it. The glowing screen showed that the rays could pass not only through the black paper but also through wood.

  The next thing he found out was that if he put his hands between the rays and a photographic plate(感光板), the rays would print a shadow of the bone framework(骨架)of his hands on the plate. In fact, the rays could pass as easily through the fleshy part of his hand as through the black paper, but hardly at all through the bone. So Roentgen made the first X-ray picture of a hand showing just how the bones in the hand fitted together.

  Roentgen called this unknown rays X-rays, but other scientists called them Roentgens rays in honor of the man who first found them.

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[  ]

A.by working hard

B.by chance

C.by doing experiment after experiment

D.with the help of several other scientists

(2) What was in the special glass tube?

[  ]

A.Air.
B.Nothing.
C.Nothing but gases.
D.None of the above.

(3) We may conclude that the rays Roentgen found were ________.

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A.dangerous
B.invisible
C.colorful
D.poisonous

(4) What could X-rays hardly pass through?

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A.Wood.
B.Glass.
C.Bones.
D.Black paper.

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  Once Wilhelm K.Roentgen and several other scientists were experimenting with passing electric currents through certain gases in a special glass tube from which the air had been taken away. Then one day Roentgen noticed that though when the tube was covered with black paper, some strange kinds of radiation was coming through and making a screen nearby glow. Roentgen could not see anything out of the tube, but then he discovered that if he put the screen in the next room on the other side of the closed door, the rays still seemed to affect it. The glowing screen showed that the rays could pass not only through the black paper but also through wood.

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  Roentgen called this unknown rays X-rays, but other scientists called them Roentgens rays in honor of the man who first found them.

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A.by working hard

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A.dangerous
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