师：Hello, boys and girls. Nice to meet you.
生：Nice to meet you.
师：Today, we are going to learn Unit 7 “What's the highest mountain in the world?” First, let's enjoy a video.
（播放视频）
师：Is it beautiful?
生：Yes.
师：Now let's learn about some famous geographical sites. Repeat after me, “geographical sites”. Geographical, geographical, geographical, geographical, geographical sites. Now let's look at the first picture. What can you see in the picture? Is it a mountain, a river, or a lake? What's it? Do you know? What is the name of the mountain?
生：Qomolangma.
师：Very good. Let's say Qomolangma. Qomolangma is the highest mountain in the world. Do you know that?
生：Yes.
师：Next, we can see a river in this picture. What is its name? Can you guess?
生：The Nile.
师：Yes, the Nile. Let's say it together. The Nile, the Nile, the Nile, the Nile, the Nile. The Nile is the longest river in the world.
师：Next, let's look at another picture. We can see a sea in this picture, but it's not a real sea. It's a lake, a salt lake. It's called the Caspian Sea. Let's say Caspian, Caspian, Caspian, Caspian, the Caspian Sea. The Caspian Sea is the largest and deepest salt lake in the world.
师：Look at this picture. What can you see? A river, a mountain, or a lake?
生：A desert.
师：And what is the name of the desert?
生：The Sahara.
师：Very good. Let's say Sahara, Sahara, Sahara, Sahara. The Sahara is the largest desert in the world.
师：Now, let's learn to read some large numbers. Can you read this number? Have a try.
（生尝试读数）
师：Okay, we can read this number like this. Let's read it together. 6,671. Now let's look at another larger number. You can have a try.
生：9 million and 600,000, 9.6 million.
师：Good. You're so smart. Good job. Thank you. Now, let's say 9.6 million km2. Remember, the way of reading is very important. Now, for the next number, 1,025. Do you think we should put “and” here? Let's check. Yes, here we can have an “and”. Now, let's read it together. One thousand and twenty - five. Next, this one is much more difficult. We say 8,844.43. 8,844.43. These numbers help us understand some facts. Let's read these numbers again. If you can read them, put up your hands. The first one.
（生读数）
师：Great. Good job. Thank you. And the next one?
生：654.
师：That's right. Sit down, please. Let's read this one together. Good. Now, how can we put these four numbers into one large number and read it? Remember, when reading a large number, we say “million” and “thousand” at the right places. And when there is a decimal point, we just read the numbers after it one by one. For example, 789,654,321. We read it as “seven hundred and eighty - nine million, six hundred and fifty - four thousand, three hundred and twenty - one”. Is it easy to read large numbers?
生：Yes.
师：Okay, then I hope you can read this large number. 101.27, 554,000.
（生读数）
师：Congratulations. Great. Thank you so much. Now, these four numbers are related to some geographical sites. This number, 8,844.43, is about Qomolangma, the Nile, the Caspian Sea, or the Sahara?
生：Qomolangma.
师：Yes, Qomolangma is 8,844.43 meters high. Answer my question. How high is Qomolangma?
生：It's 8,844.43 meters.
师：Good job. Now, let's say it together. Qomolangma is 8,844.43 meters high. Then what about this number? What geographical site is it related to? The Sahara, the Nile, or the Caspian Sea?
生：The Caspian Sea.
师：Let's check. Good. The Caspian Sea is 1,025 meters deep. Answer my question. How deep is the Caspian Sea?
生：It is 1,025 meters deep.
师：Thank you. Now, read it. The Caspian Sea is 1,025 meters deep. The other two geographical sites, which number is related to the Nile and which is related to the Sahara? Let's check. The Nile is 6,671 kilometers long. Note that it's kilometers, not meters. Then, the Sahara is 9.6 million square kilometers in size. Do you know “square kilometers”? It means km2. So, what is the size of the Sahara?
生：9.6 million square kilometers.
师：Now, I'm going to ask you some questions about these four geographical sites. Please have a quick look at these four sentences, open your books, and then listen to the conversation. Fill in the blanks to complete the sentences.
（播放听力，活动1B）
听力内容：Yesterday we learned some important geographical facts. I hope you all still remember them. I'm going to test you now by asking a few questions. First, what's the highest mountain in the world?
生：Qomolangma. It's higher than any other mountain in the world.