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huyqlht1
2 năm trước
Cho sơ đồ sau: CH4 → C2H2 → C2H4 → C2H4(OH)2 → C2H4(ONa)2. Có bao nhiêu phản ứng trong sơ đồ trên là phản ứng oxi hóa – khử ? giải tự luận giúp mình với ạ,plsss:(((
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Exercise 2: Read the following passage and choose the best answer for each blank. Overpopulation is an undesirable condition where the number of existing human population (1) _________ the carrying capacity of Earth. Overpopulation is (2) __________ by a number of factors such as reduced mortality rate, (3) __________ medical facilities, and depletion of precious resources. The effects of overpopulation are quite severe. One of these is rise in unemployment. When a country (4) _________ overpopulated, it gives rise to unemployment as there are (5) _________ jobs to support a large number of people. Rise in unemployment gives rise to (6) ________ as people will steal various items to feed their family and (7) ________ them basic amenities of life. High cost of living is another effect. As difference (8) _________ demand and supply continues to expand due to overpopulation, it raises the (9) _________ of various commodities including food, shelter and healthcare. This means that people have to pay (10) _________ to survive and feed their families. 1. A. grows B. exceeds C. domains D. increases 2. A. caused B. produced C. built D. consisted 3. A. worse B. lower C. better D. higher 4. A. makes B. engages C. gains D. becomes 5. A. fewer B. less C. more D. further 6. A. wealth B. poverty C. crime D. order 7. A. purchase B. provide C. present D. prevent 8. A. among B. above C. between D. behind 9. A. standards B. numbers C. qualities D. prices 10. A. less B. more C. fewer D. smaller

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