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（2019·四川凉山）B
Can you imagine that we could build a beautiful city with rubbish? Maybe you will think it is 48 . However, it can be true! Nothing is a waste if we have a creative mind. Let me show you something about 49 rubbish.

Sometimes we can see tons of rubbish in the streets, on the roads, near the buildings... here and there. Many large cities became so ugly 50 it. Nobody likes rubbish, but in fact, some rubbish can be used again. All of us want to solve the problem, we must do something to 51 rubbish. We should take action from now on. 52 , some good things will not be wasted.

Do you often throw away things you don’t need any more? Have you ever thought about how these things can actually be put to good use? For Example, when a car gets too old, it may not run any more. But we can use the metal of the car to make something else. When a bottle is empty, it 53 as waste. You don’t know bottle glass can be made into sand and used to build streets. Rubbish 54 food can be changed into fertilizer to make plants grow better. It is cheap and safe. And other rubbish can also be used to make building blocks. Now, 55 machines are designed for that.

56 , people will watch films in a beautiful cinema which is built out of rubbish. Besides buildings and roads, cities may be made from rubbish. But so far, building beautiful cities made from rubbish is only 57 .

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(2019·山东济宁) D

We all need cash (现金) in order to live our lives. However, something called digital currency is slowly taking the place of cash. A currency is a kind of money. Usually, we use currency when we talk about a country’s money. If something is digital, it only exists (存在) on a computer. So “digital currency” means money that only exists on computers.

Lots of people have digital currency accounts (账户). they use a credit card (信用卡) to change their real money into digital money, and then the money goes into the digital currency account. A lot of people wonder, “Why in the world should I change my real money into digital currency?” this is a fair question, but there’s a good answer. If you want to buy something online, then you usually have to use digital currency. For example, if you’re in China and you want to buy something in Canada, then you’ll have to pay with digital currency.

Many people still don’t trust digital currency. Some people think that if they can’t hold their money in their hand, then it doesn’t seem real. These people don’t feel comfortable when they see numbers on a computer screen. The computer tells them that their money is safe but these people don’t really feel safe. Another problem is security (安全). There are hackers all over the world. A hacker is a person who steels computer information. If a hacker gets the password of your digital currency account, he or she can steal your money.

You have to decide whether or not you trust this new invention. Just remember one thing: If you want to buy something online, then you probably won’ have a choice. You’ll have to digital currency.

27. What does Para.1 mainly tell us?
28. What is the “good answer” to the question in Para.2?
29. What is the first problem mentioned in Para.3?
30. Which of the following is the best title for the passage?
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