Tham khảo tài liệu 'the complete guide to the toefl test part 18', ngoại ngữ, toefl - ielts - toeic phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 94 Section 1 Guide to Reading 6. The author mentions cell phones in paragraph 6 because O they are a type of game platform that was not discussed in previous paragraphs O cell phones and computer games were developed at about the same time O computer game platforms are used only for entertainment but cell phones have more important uses O there are many similarities between cell phone design and game platform design 7. The author mentions South Korea in paragraph 7 because O PC games are still more popular than console games there O the popularity of computer games began to decline there in the mid 1990 s O several popular computer games were developed there O the market for computer games there has not behaved as it has in the biggest markets Passage 2 Blood is a complex fluid composed of several types of cells suspended in plasma the straw-colored liquid portion of the blood. Disc-shaped red blood cells make up the majority of blood cells. Hemoglobin in the red blood cells picks up oxygen in the blood and delivers it to the tissues of the body. These cells carry carbon dioxide from the body s cells to the lungs and deliver it to the tissues of the body. These cells then carry carbon dioxide from the body s cells to the lungs. Think of it as a railroad hauling freight. The cargo oxygen is loaded into a railroad car hemoglobin . Then the locomotive a red blood cell carries the cars where they are needed. After unloading the train returns with a different cargo carbon dioxide and the process starts all over again. Blood cells are made up of two components. The hemoglobin is in solution inside the cell. The cell is surrounded by a membrane that holds in the hemoglobin. A rough analogy would be a toy balloon. The plastic would be the membrane and the hemoglobin the air inside it. The blood types that most of us know A B O and AB are properties of the membrane. The hemoglobin of a person with type A blood is identical to the hemoglobin of a person with type B O or AB .
