The first photo of a black hole was shown to the whole world ______ April, 2019. We are now closer to solving the basic questions about universe.

A.in B.on C.at D.for

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According to an online survey, 93. 8% of those surveyed have joined WeChat family groups. Here are four students talking about their opinions.

Xing Yuxi, 12, Chongqing

I like to have a family group on WeChat- Hs- important to have a good relationship with family members, as we love them more than 1. else in the world. In the group, we often share photos that show our daily activities 2. each other. We freely talk about our work, school, or even entertainment. It is nice to communicate with people who know me well.

Wang Wenyi, 12, Guangdong

WeChat family groups can help us do lots of things. For example, if you want to make a big decision with your family, you can just send a single message to the 3. on WeChat instead of contacting each member separately(分開地). This 4. a lot of time.

Ma Jingwen, 14, Sichuan

I used to be in my family’s WeChat group, 5.I'm not in it anymore. I don't think it is very useful. Every morning, my family members all send the same emoji(表情), which says good morning, my friends ". They’re annoying to me. On weekends, they share many pictures while I'm trying to study. My phone keeps ringing, which really troubles me.

Hong Weicheng, 12, Guangdong

Many people share their photos, addresses, and other private information in their Wechat family groups, which is not safe. 6., the long texts and continuous voice messages are annoying to me. My family members often talk about stuff( 東西) that has nothing to do with me but I have to spend time checking the 7.anyway. It causes me to spend more time on my phone. It is8. for my eyes.

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Who would win in a competition to memorize numbers, a chimp(猩猩) or a teenager?The teenager? Think again.Scientists have proved that chimps perform better than human beings when it comes to this kind of problem. We may have to rethink what we believe about human memory.

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