The opening ceremony开幕式) of the Tokyo Summer Olympics will be on July 24, 2020. One year before the event, its medal designs were shown, CBS News reported.However, the medals are quite different from 题目和参考答案——青夏教育精英家教网—

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The opening ceremony开幕式) of the Tokyo Summer Olympics will be on July 24, 2020. One year before the event, its medal designs(奖牌设计) were shown, CBS News reported.

However, the medals are quite different from the ones seen in other Olympics. People used old cell phones and other electronic waste to make them!

The organizing committee chose the medal designs by holding a competition. Competitors brought 400 designs. The winner was 51-year-old designer Junichi Kawanishi, the Guardian wrote.

The medals look like pebbles(鹅卵石) and are 8.5 cm in diameter(直径). The front face has a picture of Nike, the Greek goddess of victory.

The committee will make 5,000 medals for this summer's games. Japan is the first Olympic host country to make all of its medals from electronic waste.

1.The Olympics will be held in Japan this summer.

2.The medals are different mostly because it has a picture of Nike in the front face.

3.Junichi Kawanishi beat the other competitors in the competition.

4.From the passage, we are sure it's the first time for an Olympic host country to make medals from waste.

5.From the passage, we can infer(推断) that Japanese value environmental protection.

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How can big data be used for good and bad thing? It is because the computer programs which are used to look at big data and understand it are written by people. People think a certain way and build a model of the ideas. These ideas are then used to look at the data. Sometimes, these ideas are helpful for people or businesses. Other times, bad ideas can cause problems for certain groups of people.

An 1.to Big Data
The meaning of big data	It is many sets of information that are put together so they can be used by a computer program. And it can have different kinds of information from many sources.
Usages of big data	●The government uses it to do researches on how many people use 2.like buses or trains to improve bus or train systems. ●Some teachers use it to know who may need extra help in class so that they can help or support the students more in school. ●Companies use big data to understand their 3.habits.
Reasons for using big data	●On the one hand, hospitals use it to make 4. about the health conditions of babies who are born too early. And the hospitals can take better care of them. ●On the other hand, it can be used to predict which kinds of people probably break the law or hurt others, even if they have not done anything wrong.
Conclusion	Big data has been widely used nowadays. It can be helpful, but sometimes, It can also cause problems. That 5. the ideas of the people who write the computer programs.