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Câu 6: Trình bày quá trình hô hấp qua mang ở cá. Vì sao mang cá có màu đỏ tươi khi sống, màu đỏ thẫm khi chết?
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Giúp mình các bn ơi =))) Read the following passage and mark the letter A, B, C, or D to indicate…. Every reader of this passage must spend the whole of his waking life looking at things. Looking, Nike breathing, is natural, we do it without noticing it. Looking is passive - but seeing is active. Once you start seeing things you really begin to wake up. People who see things which others have only looked at, and draw conclusions from what they see, can add to man's knowledge and help progress. Someone recently discovered a place where metal had been worked continuously longer than anywhere else in England. He saw a wall in the Forest of Dean. Thousands of people must have looked at it without really seeing it, but this man noticed that among the usual stones of that place were bits and pieces of a different color, they also felt different to the hand. A closer sight showed that these pieces had been left behind in the fires of ancient peoples who had melted rocks to get metals. Looking around, he found more and more information, until the history of what men had done at that place over tens of centuries was known. 36. According to the passage, "his waking life” means…….. A. the times when he is waking up B. all the time he is awake C. all the time he is alive D. all the time he is breathing 37. According to the writer of the passage, "seeing” means ………. A. noticing things which need explaining B. doing something natural C. looking at things D. doing something without noticing it 38. The man in the passage found a place where ……... A. men are starting to work metal B. men built walls of metal C. men had melted metal tens of centuries before D. men first learned to make fire with stones 39. The man who “saw” the wall got more and more information ………... A. from thousands of people who had looked at it B. from a history book C. from the usual stones of that place D. from the unusual stones of that place 40. What was it that "men had done at that place over tens of centuries”? A. Looked at the stones B. Melted metals C. Saw the stones D. Built walls

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