Xiaohongshu is a very popular app in China. It has many Chinese users. They use it for searching for information on travel, study and products. Most of the users are young women. These days, many American users suddenly started using it. 

On the evening of January 13, Xiaohongshu has become the top downloaded (下载) free app on Apple’s App Store in the U.S. Many of these users call themselves “TikTok refugees”. On January 13, the hashtag (标签) “TikTokRefugee” had about 2,000 posts and 390,000 views. By the next morning, the number of posts under this hashtag jumped to over 70,000. The numbers are keeping growing. These American users hope that Xiaohongshu will welcome them warmly.

But why do American users turn to Xiaohongshu? Because the app is easy to download and use from the US App Store. So users from different places can communicate easily.

1.1. Who are the main users of Xiaohongshu in China?

A Old men.

B Young women.

C Children.

D Young men.

解析：选B。B细节理解题。根据第一段中的“Most of the users are young women.”可知，在中国，小红书的受众群体主要以年轻女性为主。故选B。

2.2. What can we learn about Xiaohongshu from the passage?

A It is only popular in China.

B Not many people show interest in it.

C It is becoming popular among American users.

D It is mainly used for study.

解析：选C。C细节理解题。根据第一段中的“These days, many American users suddenly started using it.”这些天，许多美国用户突然开始使用它以及第二段中的“Xiaohongshu has become the top downloaded free app on Apple’s App Store in the U.S.”小红书已成为美国苹果应用商店下载量最高的免费应用可知，小红书正在美国用户中变得受欢迎。故选C。

3.3. How many posts did the hashtag “TikTokRefugee” have on the morning of January 14?

A About 2,000.

B About 390,000.

C Over 70,000.

D Less than 70,000.

解析：选C。C细节理解题。根据第二段中的“On January 13, the hashtag ‘TikTokRefugee’ had about 2,000 posts and 390,000 views. By the next morning, the number of posts under this hashtag jumped to over 70,000.”可知，1月14日早上“TikTokRefugee”这个标签下有超过7万篇帖子。故选C。

4.4. Why do American users choose Xiaohongshu according to the text?

A Because it is difficult to use.

B Because it is not available in the US.

C Because it has very few American users now.

D Because it is easy to download and use in the US.

解析：选D。D细节理解题。根据最后一段中的“Because the app is easy to download and use from the US App Store.”可知，美国用户选择小红书是因为它在美国应用商店很容易下载和使用。故选D。