阅读下面短文，根据其内容写一篇60词左右的内容概要。
If you're worried that too much “screen time ”could badly influence your child's intelligence， new research suggests you might be right. By analyzing the data gathered from over 4，500U. S. kids aged 8 to 11 between 2016 and 2017，Jeremy Walsh，a postdoctoral fellow with the CHEO Research Institute in Ottawa， found that too much “screen time” could be harming your child's intelligence.
Kids with the sharpest intellects spent less than two hours a day on their cellophanes， tablets and computers coupled with 9 to 11 hours of sleep and at least an hour of physical activity. Too much screen time could be affecting kids ability to focus， especially if they are switching between apps on a device or between different screens at the same time， Walsh suggested. “ One leading theory is that much time on screens is spent multitasking using multiple apps or devices at once，” he said. “This can interfere with a child's ability to focus and keep interest on a task. It can be damaging the building blocks for good cognition(认知).”
Sleep is important for brain development， since that's when the brain reorganizes itself and grows， Walsh added. Besides， exercise has been shown to increase blood flow to the brain and oxygenation of brain tissues， and increases the connectivity of networks in the brain. Too much screen time could lead to a“ cascade”(瀑布) effect where kids don't get enough sleep and then are less active during the day.“ You can see how this would have an impact on brain health，” Walsh said.
What should parents do? Walsh advised setting firm rules about the use of screens including how long children are using the screens， the kinds of apps they are using and how many screens they are using at once. Concerned parents also should preview games or apps before letting their child play， seek out more interactive(交互的)options that engage the child's mind， and use parental controls to block or filter content and limit screen time.
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假定你是李华，得知外教Mr. Hall寒假不回国，想邀请他到你家过春节。请给他写一封信，内容包括：
1.时间；2.一同过节的家人；3.节日活动。
注意:1.词数80左右；2.可以适当增加细节，以使行文连贯。
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阅读下面短文，根据其内容写一篇60词左右的内容概要。
In our modern world, when something wears out, we throw it away and buy a new one. The problem is that countries around the world have growing mountains of rubbish because people are throwing out more rubbish than ever before.
How do the society become a throwaway one? First of all, it is now easier to replace an object than to spend time and money repairing it. Thanks to modern manufacturing (制造业) and technology, companies are able to produce products quickly and inexpensively. Products are plentiful and cheap.
Another cause is our love of disposable (一次性的) products. As busy people, we are always looking for ways to save time and make our lives easier. Companies produce thousands of different kinds of disposable products: paper plates, plastic cups, and cameras, to name a few.
Our appetite for new products also contributes to the problem. We are addicted to buying new things. Advertisements persuade us that newer is better and that we will be happier with the latest products. The result is that we throw away useful possessions to make room for new ones.
All around the world, we can see the consequences of this throwaway lifestyle. Mountains of rubbish just keep getting bigger. To decrease the amount of rubbish and to protect the environment, more governments are requiring people to recycle materials. However, this is not enough to solve our problem.
Maybe there is another way out. We need to repair our possessions instead of throwing them away. We also need to rethink our attitudes towards spending. Repairing our possessions and changing our spending habits may be the best way to reduce the amount of rubbish and take care of our environment.
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假设你是李华。你的英国笔友John写信告诉你，近日他由于沉迷于网络游戏，健康受到很大影响。请你给他写一封回信，为他提供些建议。
1.词数: 80左右
2.可适当增加细节，以使行文连贯。
Dear John,
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Best wishes!
Yours sincerely,
Li Hua
假定你是李华，你校为庆祝澳门回归祖国20周年，将举办主题为“Great Changes and Great Achievements”的英语演讲比赛，交换生也可参加。请给你的英国朋友Peter写封邮件，邀请他参加。
内容包括：
1．比赛时间和地点；
2．报名方式。
注意：
1．词数100左右；
2．可以适当增加细节，以使行文连贯。
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假定你是李华，你们学校下周准备举行一次中西文化差异的讲座。请你写信给你同城的英国朋友Tom邀请他来参加讲座，内容包括：
1. 讲座时间、地点。
2. 讲座内容：中西文化差异。
3. 告知是否参加讲座。
注意:1. 词数100左右；
2. 可以适当增加细节，以使行文连贯。
3. 开头和结尾已经给出，不计入总词数。
Dear Tom,
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Yours,
Li Hua
