四、閱讀測驗【請依照段落上下文意，選出最適當的答案】
        Early in 2021, a little-known app called Clubhouse exploded in popularity. The app had been around since theprevious summer, but was only being used by a small handful of wealthy employees at American technologycompanies. Today, it has millions of users around the world.        Clubhouse is unlike any other app on the market. It allows users to create a room where they can invite others toparticipate in discussions. The chats are not done through text, but through audio. This way, everyone in the room canliterally have a voice and participate in conversations with strangers. Clubhouse differs from other platforms in thatthe chat rooms are created with certain topics. These can range from the stock market to cooking to politics to…well,there is no limit. One difference, and major benefit, of Clubhouse is that the audio isn’t saved after it’s heard. Peoplecan chat without much fear of their opinions being recorded, shared, and saved on the Internet.        People in China and Taiwan took advantage of that feature early in the app’s emerging popularity. It provided anopportunity for people in both countries to talk honestly and peacefully with each other. Some Chinese citizensseemed to express support for Taiwan, mentioning that their schools had forced them to learn only the Chinese side ofTaiwan’s history. Many users wanted to know more about Taiwan, and people on both sides had a civil dialogue abouttheir cultures and governments. The heartwarming chats ended soon after, though, when the Chinese authoritiesblocked the app.        Elsewhere, politicians, such as South Korea’s prime minister, are beginning to use Clubhouse, believing it mightone day become essential for keeping in touch with voters. If you’re interested in joining, be aware that you must beinvited into the service by an existing user. The same was true for Facebook in its early days, so there is a chance thatthe invitation-only feature could be dropped in the future.
【題組】31. What is the main idea of the article?
(A) A new Chinese social media app has created problems in South Korea and Taiwan.
(B) People in China and Taiwan have found a new way to discuss their problems.
(C) The government of China has banned the use of a popular new app.
(D) A new social media app has become popular because of how it works.