What is bitcoin?

    Bitcoin is a kind of digital currency, which means it doesn't exist as banknotes. At first, bitcoins were only made for collectors. {#blank#}1{#/blank#} You can store it in an online “wallet”. And with that wallet, you can spend bitcoin online and in the physical world for goods and services. More and more businesses, restaurants and universities included, accept payments in bitcoins. And, of course, bitcoin has a valuation, which you may have heard about because bitcoin's price has fluctuated up and down.

    What's different about bitcoin?

    {#blank#}2{#/blank#} That card is connected to information about you, such as your name and billing address. You can use bitcoin the same way, but unlike with a credit card, the trades you make with the currency are completely anonymous（匿名的）. They can't be used to identify you personally. {#blank#}3{#/blank#} Is that why the WannaCry attackers picked it as a form of payment?

    {#blank#}4{#/blank#}

    The bitcoin currency is unique—no authority can change the value. It's quick and easy to set up a bitcoin account. It's fast—it only takes a few minutes to transfer your payments. {#blank#}5{#/blank#}

    Possibly, Bitcoin has certainly gained fame in the news media as a technology that can result in crime. But even though the identities of people in a bitcoin trade may be hidden, the public ledger has increasingly helped law trace the movement of bitcoins from place to place.

A. What makes the bitcoin currency unique?

B. Another way of exchanging g bitcoins is at ATMs.

C. So you can use bitcoin to protect your privacy.

D. It's cheap—trade fees are usually zero, or less than 1 US cent.

E. Usually, if you pay for something on the Internet, you use a credit or debit card.

F. However, you can buy it with dollars or euros,, just like you can trade any other currency.

G. The bitcoin was introduced on the internet in 2008 by a software developer called Satoshi Nakamoto.

How to Pick the Perfect Family Tent

    People like camping. But to ensure everyone has a good time, choosing the right family tent is important. {#blank#}1{#/blank#} Here's how to choose the perfect tent for your family.

    First of all, consider the size of the camps. Generally speaking, four-and-six-person tents are popular with families. {#blank#}2{#/blank#} But a couple of features（特点）can make all the difference. For families with small children, a tent with a single entrance is a better choice. This makes it easier to keep track of who's coming and going. Of course, two doors can offer added more convenience.

    Some tents require two full-grown adults to set them up. {#blank#}3{#/blank#} Be sure to take into account the setup and breakdown needs of any model you're considering. It may be necessary to go with a smaller model, or even two smaller tents, rather than one large tent for your family.

{#blank#}4{#/blank#} Or, if friends have a tent, see if you can borrow it for an overnight in your backyard. You'll quickly discover what you like and don't like.

    As an alternative, many outdoor shops have rental departments. Do your research to determine what style and size you think would work best, and find out if you can rent that model or one that's similar. Finally, if you are in a rush, ask if you can climb inside the tent at the store. {#blank#}5{#/blank#}

A. Getting in and out of the tent sounds basic.

B. To save money, you can make one on your own.

C. But you can turn to anyone for help when necessary.

D. It could be a problem if you're the only adult when camping.

E. Take the tent you are considering out for a “test drive” before you buy.

F. It's your home away from home, and the place where you'll sleep and relax.

G. This will give you a chance to assess all the features up close and in person.

    Having a busy schedule can result in chaos (混乱) as well as the lack of not completing various tasks at hand. {#blank#}1{#/blank#} Below are some tips of how to improve it.

    Set up a planning system

    There are several planning systems you can use. {#blank#}2{#/blank#} With a planning system in place, when you have a task to do, you need to record the details of the task. Record what you need to do, the date it should be done and the time to complete the task.

    {#blank#}3{#/blank#}

    Having a busy day can result in disorganization and many tasks will not be done. When you check your planner before starting your day, you will know what should be done, at what time and for how long.

    Complete tasks at the scheduled time

    In your planner, you have organized every task to be done at a specific (特定的)time and at a specific date. {#blank#}4{#/blank#} If you don't complete a task at a specific time or spend too much time completing a task, you will disorganize everything.

    Clean your work-space

    You need to be organized, therefore clean your work-space before and after you have completed the task. If the books were for a past homework, you need to clean up first before starting the new task. {#blank#}5{#/blank#}.

    Remember, an organized day in your life will save a lot and will help you enjoy your life.

A. Check your planner ahead of time

B. Finish your task as soon as possible

C. Don't deal with many tasks at a time

D. This will ensure every item is at its proper place

E. In order to have an enjoyable day, you need to start being organized

F. Make sure that every task is completed at the time and date scheduled

G. They include notebooks, a planning book and a smartphone with a to-do app

    Every new person added to the planet needs food, water, clothes, and so on.{#blank#}1{#/blank#}. Those things require extra natural resources，including land and water. But Earth's riches are limited. Less than 1 percent of Earths water can be used for drinking and washing. One out of every thirteen people around the world does not always have enough clean water. {#blank#}2{#/blank#}. Too many people are using too much water, especially in the already dry areas of the southwestern United States.

    Food shortages(不足)are even more common. Worldwide, one out of every seven people does not get enough to eat. {#blank#}3{#/blank#}. Over time, the soil loses its nutrients (营养）and the farmland becomes useless for growing food. As the world becomes more crowded (拥挤的）， more land is needed to make way for growing cities.{#blank#}4{#/blank#}. That's a problem because trees help take in a gas called carbon dioxide. Humans produce carbon dioxide by burning coal and oil. Fewer trees mean more carbon dioxide in the atmosphere. The buildup of carbon dioxide traps heat and pollution above Earth.

    {#blank#}5{#/blank#}, although every person uses the planet's resources. The richest billion people, Americans especially, use the most resources. They also produce the most waste.

A. Forests are cleared away

B. Some people use a lot more than others

C. Water shortages have hit many parts of the world

D. Water pollution is a serious problem in some areas

E. More trees should be planted to handle air pollution

F. Huge needs for food force farmers to overuse their land

G. More people mean more cars, roads, schools, hospitals, and stores

    The "Chong Yang Festival" is celebrated on the ninth day of the ninth lunar month, which is also known as the Double Ninth Festival.{#blank#}1{#/blank#}.

    Climbing Mountains

    People like to climb mountains on this festival, so Double Ninth Festival is also called "Mountain-climbing Festival".

    The 9th lunar month, with clear autumn sky and bracing air, is a good time for sightseeing.{#blank#}2{#/blank#}. It is really refreshing to climb mountains and enjoy the beauty of nature at this bright and clear time in autumn.

    Climbing mounting also indicates "climbing to a higher position". Another reason why climbing mountains are valued by people, especially by the elderly is that it has a meaning of "climbing to ligneous life". Climbing mountains on Double Ninth Festival was already popular in the Tang Dynasty.{#blank#}3{#/blank#}.

    Drinking Chrysanthemum Flower(菊花) Wine

    The chrysanthemum flower wine is unique in brewing. In ancient times, people usually picked fresh chrysanthemum flowers and leaves on the 9th of the 9th lunar month, and brewed the mixture of them and grains into the wine.{#blank#}4{#/blank#}. The wine is said to have wholesome effects on sharpness of the eye, drop of high blood pressure, reduction of weight and removal of stomach trouble, thus contributing to longevity.

    {#blank#}5{#/blank#}.

    The Double Ninth cake is also known as "flower cake". It dates back to the Zhou Dynasty. It is said that the cake was originally prepared after autumn harvests for farmers to have a taste of what was just in season, and it gradually grew into the present cake for people to eat on the Double Ninth Day.

A. Eating Double Ninth Cake

B. Making “flower cake” with friends

C. A lot of poems were devoted to this custom

D. So people love to go sightseeing this month

E. It would not be drunk until the same day next year

F. Here are some traditional customs of the Double Ninth Festival

G. But few Chinese people are aware of the importance of the festival

    Since the 1980s eco-tourism has grown and grown. It is the fastest growing type of tourism.

    If done well, eco-tourism has several advantages. It is kinder to the environment. {#blank#}1{#/blank#}This means that more natural habitat is protected and that the resources for building come from sustainable (可持续的) sources. Another advantage is that people in the developed world through eco-tourism get to experience places of great natural importance as well as communicating with local people. {#blank#}2{#/blank#}

    However, there are some disadvantages of eco-tourism. It is felt by some environmentalists that any human activity will cause disorder in the routine of animals. {#blank#}3{#/blank#}

    Another problem for local people is that they are expected to pose for cameras and dance etc. for money. {#blank#}4{#/blank#}The tourists are destroying the culture that they are paying to protect.

    Eco-tourism tries to go to the places far away from other communities. {#blank#}5{#/blank#}There is nothing stopping people taking money from tourists as well as doing environmentally unfriendly activities.

    It seems that the disadvantages often outweigh the advantages of eco-tourism. It might be better to take pictures of animals rather than kill animals, but given the choice the animals would sooner not have people around. It seems whether eco-tourism should be allowed should be judged case-by-case, and that the local people must be considered.

A. These places are often not well policed.

B. People walking through the forest may do much harm.

C. And these activities will also damage the eco-system.

D. It seldom ends people to untouched parts of the world.

E. This is good for both parties: they both can better understand each other.

F. And it encourages developers to consider the natural environment more.

G. It discourages the local people from pursuing their traditional life styles.