On June 26th, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could now read the whole “map” of the human body: DNA. DNA is something that all humans have, and it tells the body what to do. DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own. Now we can read some of this “map”, and so we can find out more about how our bodies work.

    People have been trying to understand the human body for a long time. In 1860, Gregory Mendel discovered that there is a special reason why we look the same as other people in our family. It is because of small things called “genes” that we have in our body. In 1953, James Watson and Francis Crick made another discovery and found out that those small parts are really messages written in the DNA with a special language.

    In 1961, Marshall Nirenberg and Johann Matthaei found the first “word” that they could understand in that language, showing how DNA tells the cell to build its parts. This meant that one day we would be able to read all the messages that a human body gets from its parents' bodies. Scientists have now found all the words in DNA map, but we still do not understand what they all do. By understanding what just one “word” means, we can help save people from several diseases. So the more we understand, the more doctors will be able to do.

    Most people hope that this will help to make better medicine and help people who are very ill. Other people worry about that when we learn more words and find out lots of other information, we still use it in the wrong way, just to make people more attractive, or stop sick people getting jobs.

A. It is very hard to break a code without the code book.

B. Only people who know the keyword can read the message.

C. As long as there have been codes, people have tried to break them.

D. You can hide a message by having the first letters of each word spell it out.

E. With a code book, you might write down words that would stand for other words.

F. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.

    Secret codes (密码)keep messages private. Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.

    People have used secret codes for thousands of years. {#blank#}1{#/blank#}Code breaking never lags(落后) far behind code making. The science of creating and reading coded messages is called cryptography.

    There are three main types of cryptography. {#blank#}2{#/blank#}For example, the first letters of "My elephant eats too many eels" Spell out the hidden message "Meet me."

    {#blank#}3{#/blank#}You might represent each letter with a number, for example, Let's number the letters of the alphabet, in order, from 1 to 26. If we substitute a number for each letter, the message "Meet me" would read "13, 5, 5, 20, 15, 5."

    A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. {#blank#}4{#/blank#} For example, "bridge" might stand for "meet" and "out" might stand for "me." The message "bridge out" would actually mean "Meet me." {#blank#}5{#/blank#} However, it is also hard to keep a code book secret for long. So codes must be changed frequently.

    Bird lovers know that a good place to go bird-watching is Guandu Nature Park. As many as 220 kinds of birds come to this park every year. Since the park offers birds lots of food to eat and places to build their nests, it has become a paradise（天堂）for birds.

    Guandu Nature Park is also a great outdoor classroom. The park's Nature Center provides guided tours to the public. During the tour, visitors can learn about the environment. So, if you want to have a fun and educational weekend, come to Guandu Nature Park. Get away from city life and head into nature.

    In 2011, when British photographer David J. Slater was visiting a park in Indonesia, his camera was taken away by a group of black monkeys. The result was hundreds of monkey selfies(自拍照). The best ones show a monkey smiling toothily for the camera. {#blank#}1{#/blank#}

    Nobody knew they would create a copyright (版权) battle three years later.

    Last month, a website put the monkey selfies online under a collection d free photos without Slater's permission (允许). {#blank#}2{#/blank#}

    However, the website refused to do so. They said that according to US copyright law, whoever pushes the button on the camera owns the copyright to the photo. {#blank#}3{#/blank#}

    They said, "US copyright law says that works that come from a non-human source can't ask for copyright. That means monkeys don't own copyright. "

    {#blank#}4{#/blank#} He said he bought the cameras; he spent a lot of money traveling to Indonesia, and it was his carelessness that allowed the monkeys to take his cameras away.  All these have made him own the pictures, no matter who pushed the button. In a sense, the monkeys helped him take the photos, Slater said.

    {#blank#}5{#/blank#} Who do you think will win this interesting battle?

A. It was the monkeys but not Slater that pushed the button.

B. As of now, there has been no result in the Monkey Selfie case.

C. Slater then sold the photos and they became popular on the Internet.

D. Slater asked the website to take them down since he owns the copyright.

E. Slater argues that the pictures belong to him as they were taken from his camera.

    Perhaps you've already watched or heard about Readers 《朗读者》，a TV show that has recently become popular. It invites different people to read aloud on the stage, as well as tell the touching stories behind them. They can read everything, like poems, books and letters.

    Many people are fans of the show and begin to enjoy reading aloud at home. Now the show gives people a special place to read across China. Reading pavilions(朗读亭)are now in cities like Shanghai, Hangzhou and Xi'an.

    The pavilion is quite small. Only one person can come into it each time. There is a microphone in it and it records people's voices. Everyone can read anything they like for three minutes in the pavilion. The show will later pick some of the readers and invite them to read on TV.

    People of all ages have come and read in the pavilion, according to People's Daily. "Reading should be just like singing and talking," said Dong Qing, the host of the show. "We can actually express our deep feelings through reading aloud."

    Both the TV show and the pavilion are promoting(推进)reading among the public. In fact, our country is also trying to do that now.

    Rainforests are magical(神奇的)places on earth, full of life and beauty. They are homes, to millions of birds, insects, animals, and plants. These forests are the world's natural treasure(财富).

    Most rainforests are near the equator(赤道). Some of the largest are in Brazil, South Asia and Central Africa. There are several kinds. Each has different levels of rainfall and different types of soil and temperature.

    In equatorial rainforests, the temperature stays between 25 and 35 degrees during the year. These rainforests get a lot of rain-as much as 4, 000 millimeters per year. Monsoon rainforests are very different. They have long dry periods. Also, their temperature can change a lot from season to season.

    Rainforests are important for many reasons. One is their great diversity(多样性)of life. There are millions of species of insects, animals, and plants. Scientists still don't know about most of them yet. Many rainforest plants could help us make new medicines. Rainforests also keep the soil strong. And they may be important to the earth's climate.

    Unfortunately, rainforests are getting smaller every year. Farmers burn down trees for land. Large companies cut down trees for their valuable wood. Other companies build mines near forests.

    Environmental groups are trying hard to save the rainforests. Hopefully they can, before they're all gone.