Ý nghĩa của điểm giới hạn trên và giới hạn dưới của một nhân tố sinh thái là gì ? A. Giới hạn mà ở đó sinh vật bị chết. B. Giới hạn mà ở đó sinh vật bắt đầu chết. C. Giới hạn mà ở ngoài giới hạn đó sinh vật sẽ chết. D. Sinh vật chỉ sống sót khi nằm ngoài giới hạn đó.

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VII. Choose the word (a, b, c, or d) that best fits each of the blank spaces. This composition is about my aunt's (1)......... in Florida last year. She hired a car at Miami (2)........ , and soon (3)..........lost. So, she stopped to ask a young man how to get to the hotel. Unfortunately, the young man had a gun; he made my aunt get (4)............ of the car, and she had to give him all her money. Luckily, a police car drove past a few minutes later and (5).......... . Then, the police arrested the thief and got my aunt's money back. (6)........ the end, my aunt had quite a good holiday, but she said that she was happy to get back home. 1. a. holiday b. vacation c. festival d. a & b 2. a. airport b. airway c. airplane d. airstrip 3. a. took b. had c. got d. caught 4. a. in b. out c. inside d. outside 5. a. picked her up b. picked up her c. showed her around d. showed around her 6. a. In b. At c. On d. When VIII. Make up sentences using the words and phrases given: 1. We/ used/ school/ on/ foot. ...................................................................................................................... 2. about / 30km/ my town/ Ha Long Bay/. ...................................................................................................................... 3. My family/ used/ go / holiday / seaside / summer/. ...................................................................................................................... 4. How/ long / it / take/ you/ Ha Noi / Sa Pa/? ...................................................................................................................... 5. There / used / be / a factory / town centre / but/ it / move/ the/ suburbs/. ...................................................................................................................... 6. You/ must / learn / about / road safety/ before/ riding/ your/ bike/ road/.