3. Visiting one of the world's largest waterfalls was a magical experience. 参观世界上最大的瀑布之一，是一次魔幻之旅。
【感知】(1)The light bulb is one of the most helpful inventions. 灯泡是最有用的发明之一。
(2)Confucius is one of the most famous thinkers and philosophers in Chinese history. 孔子是中国历史上最著名的思想家和哲学家之一。
(3)Shanghai is one of the biggest cities in the world. 上海是世界上最大的城市之一。
【思考】观察上面的句子，当表示“最……之一”时，我们用“one of + the + + 可数名词(形式)”。
【运用】
(1)China is in the world. 中国是世界上最古老的国家之一。
(2)The Amazon Rainforest is natural (世界上最美的自然奇迹之一)on Earth.

思考：形容词最高级；复数
运用：（1）one of the oldest countries （2）one of the most beautiful；wonders

4. —How deep is it? 它有多深？
—It is about 11,000 meters deep. 它大约1万1千米深。
【思考】计量表达法：数字 + 计量单位[meter(s)/kilometer(s)/year(s) old...] + 形容词(high/long/wide/deep等)。在疑问句中，用来提问高度/长度/宽度/深度等。
【运用】
(1)The new building is 198 meters tall.(对画线部分提问)
is the new building?
(2)—Do you know the new bridge is?
—About 1,600 meters.
A. how long
B. how far
C. how tall

思考：How+形容词
运用：（1）How tall （2）A

一、单词拼写与运用
根据所给首字母或汉语提示完成句子。
1. The natural world is full of w.
2. We should take action to (保护)the wild animals in the forest.
3. The river's s is smooth and clear on quiet days, reflecting the blue sky and green trees.
4. It was u to see snow in our city in April.
5. The teacher said that my English listening (水平)has improved a lot since last term.
6. Scientists are studying the (深度)of the ocean to learn more about marine(海洋的)life.
7. We could see colourful fish swimming (在……下面)the clear water of the lake.
8. With the (发展)of science and technology, our life is getting better and better.

一、1. wonders 2. protect 3. surface 4. unusual 5. level 6. depth 7. below 8. development