Tham khảo tài liệu 'phân tích bài đọc trong toiec12', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | c need d change 24. The word diffuses in line 19 is closest in meaning to a yields b starts c surfaces d travels 25. What happens to nitrogen in body tissues if a diver ascends too quickly a it forms bubbles. b It goes directly to the brain c It is reabsorbed by the lungs d It has a narcotic effect 26. The word they in line 21 refers to a joints b pains c bubbles d tissues 27. The word rupture in line 26 is closest in meaning to a hurt b shrink c burst d stop 28. It can be inferred from the passage that which of the following presents the greatest danger to a diver a pressurized helium b Nitrogen diffusion c Nitrogen bubbles d An air embolism 29. What should a diver do when ascending a Rise slowly b Breathe faster c Relax completely d Breathe helium Questions 30-39 Each advance in microscopic technique has provided scientists with new perspectives on the function of living organisms and the nature of matter itself. The invention of the visible-light microscope late in the sixteenth century introduced a previously unknown Line realm of single-celled plants and animals. In the twentieth century electron microscopes 5 have provided direct views of viruses and minuscule surface structures. Now another type of microscope one that utilizes x-rays rather than light or electrons offers a different way of examining tiny details it should extend human perception still farther into the natural world. The dream of building an x-ray microscope dates to 1895 its development however 10 was virtually halted in the 1940 s because the development of the electron microscope was progressing rapidly. During the 1940 s electron microscopes routinely achieved resolution better than that possible with a visible-light microscope while the performance of x-ray microscopes resisted improvement. In recent years however interest in x-ray microscopes has revived largely because of advances such as the 15 development of new sources of x-ray illumination. As a result the brightness available .