Đọc đoạn văn sau và trả lời các câu hỏi: Fog  occurs when damp air above the surface of the earth is cooled to the point at  which it condenses. Of the two types of fog, advection fog occurs along the  ocean coast or near rivers or lakes. This type of fast-moving fog, which may  cover vast areas, occurs when warm 5 winds blow across a cold surface of land or  water. In this collision of heat and cold, the warm air is cooled to the point  at which the water vapor condenses into fog. Radiation fog, quite different from  advection fog, is immobile cloud-like moisture generally found hovering
over wintertime valleys. It occurs on clear nights when the earth's 10 warmth  escapes into the upper atmosphere.
1. According to the passage, fog is found when wetness in the air is 
2. According to the passage, advection fog is found 
3. In the passage, radiation fog is said to be 
4. According to the passage, which of the following statements about fog is  true? 
5. The author's purpose in this passage is to 
Back Test with: Reading-Comprehension-Lesson 144 and Reading-Comprehension-Lesson 145
 
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