Unit 7 Whats the highest mountain in the world？ Section A(2a 2c)The longest river in the world the Nile-how long is it? -Its about 6,671 kilometers long.The worlds highestmountain in the world. how high is it?It is 8,844.43 metershigh. QomolangmaWhats the size ?It is about 9,600,000 square kilometers in size. the SaharaThe worlds biggest desertThe worlds deepest salt lake The Caspian Seahow deep is it?It is 1,025 meters deep.The highest mountain in China. HimalayaThe longest river in China/Asia. The Yangtze RiverThe second longest river in China/ Asia. The Yellow RiverPair-workA: Did you know China is one of the oldest countries ?B: Yes, I did. It is over 5,000 years old.A: Did you know that the Yangtze River is the longest river in Asia?B: Yes, I did. It is 6,300 kilometers long.longestlongerhighpopularbigoldermuch1. -Which is _ season in Beijing? (2-I think its autumn. A. good B. better C. best D. the best 该题的核心词为该题的核心词为season。根据比较级与最高。根据比较级与最高级的知识级的知识, 两者之间用比较级两者之间用比较级, 而三者或三而三者或三者以上用最高级者以上用最高级, 北京有四季北京有四季, 因此本题应因此本题应选择最高级。又因为形容词最高级前要加选择最高级。又因为形容词最高级前要加定冠词定冠词the, 因此答案为因此答案为D。 2. - Which is_ , the sun, the moon or the earth?- Of course, the moon is.A. small B. smaller C. smallest D. the smallest解析：正确答案为解析：正确答案为D。该题的核。该题的核心词在第一句句尾，心词在第一句句尾，the sun, the moon or the earth, 提问的对象为三提问的对象为三者，应该选择最高级。者，应该选择最高级。3. The air in Beijing is getting much _.A. clean B. cleaner C. cleanest D. the cleanest该题的核心词为该题的核心词为much，much一一词修饰比较级。词修饰比较级。4. Mobile phones are very popular now and they are _ than before.A. cheap B. cheaper C. cheapest D. the cheapest该题与第三题相似，核心词为该题与第三题相似，核心词为than。