Question

【題目】 X-rays are high energy waves that are invisible. 【1】For example,doctors can see inside the human body and security guards at airports can see inside your handbag. In 1895,the German scientist,Wilhelm Rontgen,discovered X-rays by accident. He called them X-rays because he hadn't seen such a form of radiation before. 【2】Wilhelm took the first X-ray picture of the bones of his wife's hand after the discovery. In 1901,he received the first Nobel Prize in Physics for his discovery.

X-rays are valuable in medicine because then can see through certain parts of the body. Doctors can take pictures to see which bones are broken or to find out which teeth have holes. The X-rays are strong enough to pass through the skin and muscles,but they cannot pass through hard objects like bones. In the picture,hard objects like bones are white area【3】

There are some situations in which X-rays cannot give you a clear picture. Some organs,for example,may prevent X-rays from showing a broken bone. For this reason,computed tomography(CT)was invented. A person is put inside a scanner,which is a large tube-shaped machine. 【4】 A computer puts together all of these images,which can show doctors more than a normal X-ray can.

【5】Patients must wear protective clothing for the parts of their body that are not X-rayed. Doc- tors and helpers who work with X-ray machines must wear lead aprons and stand behind screens.

A.Then the person is X-rayed from all sides.

B.Objects that X-rays go through appear dark.

C.In mathematics,X means something unknown.

D.An X-ray machine is used to take these pictures.

E.X-rays,however,can also do harm to your body.

F.However,they can be an essential tool for finding out what's wrong with you.

G.They are useful because they can pass through many things that normal light cannot.

Answer 1

【答案】

【1】G

【2】C

【3】B

【4】A

【5】E

【解析】

這是一篇說明文。文章介紹X射線的用途。

【1】根據(jù)上文提示“X射線是不可見的高能波。”再根據(jù)下文提示“例如，醫(yī)生可以看到人體內(nèi)部，機場保安可以看到你的手提包內(nèi)部。”承接上下文，G項They are useful because they can pass through many things that normal light cannot.（它們很有用，因為它們可以穿過許多普通光不能穿過的東西。）切題。故選G。

【2】根據(jù)上文提示“他稱它們?yōu)?/span>X射線是因為他以前從未見過這種形式的輻射。”再根據(jù)下文提示“在這個發(fā)現(xiàn)之后，威廉給他妻子的手骨拍了第一張X光照片。”承接上下文，C項In mathematics,X means something unknown.（在數(shù)學(xué)中，X表示未知的東西。）切題。故選C。

【3】根據(jù)下文提示“在圖片中，像骨頭這樣的堅硬物體是白色區(qū)域。”承接上文，B項Objects that X-rays go through appear dark.（被X射線穿透的物體看起來是黑暗的。）切題。故選B。

【4】根據(jù)上文提示“一個人被放進一個掃描儀里，這是一個大型的管狀機器。”再根據(jù)下文提示“計算機將所有這些圖像組合在一起，可以向醫(yī)生展示比普通X光更多的圖像。”承接上下文，A項Then the person is X-rayed from all sides.（然后對病人進行X光檢查。）切題。故選A。

【5】根據(jù)下文提示“病人身體未被X光照射的部位必須穿防護服。”承接下文，E項X-rays,however,can also do harm to your body.（然而，X光也會傷害你的身體。）切題。故選E。