一 重点单词
1. (n.) 瀑布 2. (n.) 沙漠
3. development (n.) 发展 → (v.) 发育；发展

一、1. waterfall 2. desert 3. develop

二、重点短语
4. at all costs 5. the second longest

二、4. 不惜任何代价 5. 第二长

三、重点句型
6. (3a) The Yangtze River is in China. 长江是中国最长的河流。
7. (3a) It and is about 6, 300 kilometres long. 它是流经距离最长的河流，它的长度大约是六千三百米。
8. (3a) Some parts of the river . 这条河的某些河段携带着褐色和黄色的泥土。
9. (3a) Both the Nile and the Yellow River . 尼罗河和黄河都促进了古文明的发展。
10. (3a) We should protect our homes . 无论如何，我们应该想尽一切办法保护我们的家园。

三、6. the longest river
7. travels the farthest
8. carry brown and yellow earth
9. helped ancient civilizations to develop/helped the development of ancient civilizations
10. by all means

一 用括号中所给单词的适当形式填空
1. The Nile is the (long) river in Africa.
2. The (develop) of the Internet has changed the way we communicate with each other.
3. The Yangtze River is around 6, 300 (kilometre) long.
4. I like (learn) about rivers.
5. The Nile is very important in (Egypt) history.
6. What is the (mean) of the word “protect”?

一、1. longest 2. development 3. kilometres/kilometers 4. learning/to learn
5. Egypt’s 6. meaning