In 1895, the German physicist Wilhem Roentgen noticed that his cathode ray tube (阴极射线管) seemed to be producing some other sort of ray in addition to the lights inside the tube. These new rays were     1    (visible) but caused a screen in his laboratory to light up. He tried to block the rays, but they passed right     2     paper, copper, and aluminum, but not lead. And not bone. Roentgen noticed that the rays     3     (reveal) the faint shadow of the bones in his hand! Roentgen had discovered X-rays,     4     form of electromagnetic radiation. This discovery would, of course, shortly lead lo the invention of the X-ray machine, which would in turn, evolve into the CT scan machine, both of     5     would become essential to non - invasive medical diagnoses MCN (非介入式诊断). And the CT scanner     6     (it) would soon be adopted by other     7     (branch) of science, in which CT scans     8     (use) to study the inside parts of fossils (化石).     9    (additional), the discovery of X-ray would eventually lead to the development of X-ray telescopes to detect radiation     10     (deliver) in deep space by objects. And these telescopes would, in turn, throw light on black holes and the origin, of the universe.

China’s first large home-made cruise ship (游轮), roughly the height of a 25-story building, is     1    (schedule) to be delivered to its user around the end of this year. Construction of the ship, which has yet to be named, started in October, 2019.

“So far, we have completed 90 percent of the cruise ship’s construction. Engineers have begun to install inner     2    (equip). We plan to move it out of the dry dock in June     3    (continue) the fitting process,” said Chen Gang, chief designer of the large cruise ship. After the construction finishes, there will be at least two sea trials in the summer to test the ship, and also to check     4     the rooms and entertainment facilities (设施) are comfortable. There will be 16 stories of living, shopping and entertainment space, which will offer a variety of musical     5    (performance), art shows and food options.

“Upon its completion, there will be about 25 million components on the ship, 5 times that of China’s home-designed C919 plane and 13 times that on the Fuxing- series bullet train. The     6    (combine) length of the electric cables on the ship is more than 4, 200 kilometers,” Chen said,     7    (note) that his shipyard has used a lot of advanced techniques and machinery to build the ship.

The project marks the first time China has built a large advanced cruise ship     8     its own. It is a new milestone for the country’s shipbuilding industry because it marks an end to the time     9     China couldn’t design and construct large cruise ships     10    (independent).

A fateful conversation inspired the creation of the First Aid Kit, which was released in 1888. Aboard a train heading to Colorado for vacation, company     1     (found) Robert Wood Johnson struck up a conversation     2     a doctor. The doctor explained to him the     3     (danger) of railroad construction and the lack of medical supplies    4     (treat) the unique industrial injuries. From this exchange, Johnson saw     5    opportunity to both advance the field of healthcare and build     6     (he) young business. And the commercial First Aid Kit was born.

However, Kilmer knew that the kits, themselves, were not enough. They needed to include explanation and training. Since its founding, the company had prided itself on     7     (educate) the public and spreading methods of wound care. In 1901, the nation’s first     8     (commercial) available guide to first aid, the Hand Book of First Aid,     9     (publish). The guide reached beyond the railroad and medical industries,showing readers     10     to save lives with their first aid skills.