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21. D
22. D
23. A
24. B
25. A
26. A
27. B
28. D
29. C
30. B
31. B
32. C
33. C
34. D
35. A
36. A
37. B
38. A
39. D
40. B
41. E
42. C
43. F
44. G
45. B
46. 它们有时会跋涉60多英里去寻找食物或水，而且非常善于找出其他大象的位置——即使它们不在其视线范围内。
47. 研究人员确信，大象总是精确地感知它们相对于所有所需资源的位置，因此它们不但可以沿着熟悉的路线前进，还可以抄近路。
48. 一种可能是，它们只是用眼睛看，并尝试它们找到的植物，但这可能会导致大量的时间和精力浪费，尤其是因为它们的视力实际上并不是很好。
49. 植物产生的挥发性化学物质可以被扩散至很远，而且它们非常有特点：每种植物或树木都有自己独特的气味特征。
50. 实验结果表明，大象很可能利用气味来识别适合食用的树丛，其次还可以利用气味来评估每片树丛中树木的品质。
Dear Paul,
I have just received your email, and I hope my reply finds you well. To prepare for your oral report on an ancient Chinese scientist, I think you should first select one, such as Shen Kuo, Zhang Heng, or Zu Chongzhi. Then do a lot of information gathering to ensure that your report focuses on conveying the scientist's contributions, impact, and historical context and covering the scientist's life and discoveries. To grab your audience's attention, I think you'd better begin with an attractive and interesting introduction and use lots of anecdotes to make it engaging. Remember to practice your presentation to enhance confidence and coherence. Good luck, and I'm sure you'll do well.
Sincerely yours,
Li Ming
The drawing on the left depicts the scene of some city dwellers doing physical exercise in a park, and one of them expresses his satisfaction with the newly built park. The bar chart on the right shows an upward trend in the number of parks of a city in recent three years. I think the two pictures reveal city parks play a vital role in promoting physical activity, and that the number of city parks is a crucial aspect of public well-being.
Firstly, city parks offer opportunities for physical exercise, contributing to people's overall health. They serve as venues for recreational activities such as jogging, cycling, and sports, reducing the risk of sedentary lifestyles. Secondly, the presence of green spaces has positive effects on mental health. Parks provide serene environments, offering an escape from the hustle and bustle of urban life. And nature has proven benefits in reducing stress and anxiety, helping to keep a healthier mental state for city residents.
In my opinion, it is important to build more parks in cities. A higher number of city parks correlates positively with improved physical and mental health for urban populations. Prioritizing the creation of parks in urban planning is not only an investment in environmental sustainability but also an important step towards fostering healthier communities.
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