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8. 18克的氫氣與96克的氧氣進行反應可生成多少克的水? (A)32克 (B)54克 (C)108克 (D) 162克

9.氯酸鉀(KC1O3)分子量為122.5g/mol,經高溫加熱會產生氯化鉀(KCI)以及氧氣,現有氯酸鉀245克加熱產生72克氧氣,請問反應的產率是多少? (A) 100% (B) 90% (C)80%(D) 75%

43. What does the word “canopy” most likely mean in the passage? (A) A tool used for climbing to the summit of trees. (B) A tent built for research purposes on the top of a tree. (C) The upper layer of the forest formed by treetops. (D) The roots of a tree spreading apart underground.

44. Which of the following best describes how the walkway project developed over time? (A) It began as a local experiment and expanded into an international network. (B) It changed its focus from research to tourism and public recreation. (C) It had some first success but eventually failed due to a lack of funding. (D) It started as a tropical study and later moved to colder regions.

45. What can be inferred about the author’s attitude toward the walkways? (A) He believes they are more exciting than laboratory research. (B) He regrets that the walkways became too commercialized. (C) He sees them as a simple but powerful tool for learning. (D) He thinks they are too costly for educational purposes.

1. 袋子中有2個紅球、3個黑球、5個白球,每次從袋中抽出1球後放回,共抽3次,請問3球中有2個是紅球之機率為何?(A) 0.024 (B) 0.032 (C) 0.064 (D) 0.096