Texte d'après Tom Harris "How Xray works"
http://science.howstuffworks.com/x-ray.htm

question 1

Mettez les verbes à la forme adaptée, et complétez les mots dont les premières lettres sont données.

As with many of mankind's monumental discoveries, X-ray technology (to invent) completely b accident. In 1895, a German physicist named Wilhelm Roentgen (to make) the discovery while (to experiment) with electron beams in a gas discharge tube. Roentgen noticed that a fluorescent screen in his lab (to start) to glow when the electron beam was turned on. This response in itself wasn't so surprising -- fluorescent material normally (to glow) in reaction to electromagnetic radiation -- but Roentgen's tube was surrounded by heavy black cardboard. Roentgen assumed this would have blocked (la plupart de) the radiation.


Roentgen placed various objects (entre) the tube and the screen, and the screen still glowed. Finally, he (to put) his hand in front of the tube, and (to see) the silhouette of his bones projected onto the fluorescent screen. Immediately after (to discover) X-rays themselves, he had discovered their most beneficial application.

Roentgen's remarkable discovery precipitated one of the most important medical advancements in human history. X-ray technology (to let) doctors see straight (à travers) human tissue to examine broken bones, cavities and swallowed objects with extraordinary ease. Modified X-ray procedures can (to use) to examine softer tissue, (comme) the lungs, blood vessels or the intestines.