The leaders （领导人） of 13 countries had a big meeting in St Petersburg, Russia from November 21 to 24, 2010.The meeting was about tigers. They talked about the ways to protect the animals in their countries. They agreed to spend more money protecting tigers and they wanted to double the number of tigers in the world before 2022.

    Tiger is one of the world's most endangered animals. The World Wildlife Fund （WWF） says, there are only about 100,000 wild tigers now. And the number is becoming smaller and smaller. 'If nothing happens, tigers will face disasters,' said WWF spokeswoman Marie von Zeipel.

Nine types of tigers lived 100 years ago, but now at least three of them have died out. ‘If people leave tigers alone and don't kill them, then the number of tigers will double in 10 years,' said Jean-Christoph Vie, a French tiger expert (专家).

    China is one of the 13 countries where tigers live. There are about 50 wild tigers in China now. They are the Bengal tigers in Tibet, Indochinese tigers in China's southwest, and Siberian tigers in the northeast. The South China tigers lived in southeast China many years ago but disappeared in the 1970s. Many experts think they have already died out.

阅读理解

    Water is a liquid (液体) ; but it can also be a solid when it is very cold and turns to ice. It can also be a gas, when it evaporates (蒸发) and become water vapour (水蒸气) .

The water cycle

    Water is very important, and without it life on Earth would be impossible. The oceans that cover three quarters of the Earth's surface can be thought of as our great water reservoirs. All the time, water is being evaporated from the ocean's surface by the warmth of the sun. High in the sky this water vapour, turns into clouds which drift (漂浮) over the land, often creating rainfall. As the rain falls,it seeps (渗漏) into the soil and then into rivers that flow back into the oceans, where it is ready to begin all over again!

下面是被打乱的有关The water cycle（水循环）的信息，请根据短文内容重新排序。首句己给出：

Water is warmed by the sun and turns into water vapour and rises into the sky.

    The Smallest Life Around Us

    Tiny plants and animals live all around us．We cannot see them because they are so small，but they are everywhere. They live in the soil，in the air，and in rivers and oceans．They grow on mountains and in caves．Some live in the ice at the north and south poles; some live where it is very hot．They are found throughout cities and in the country. They grow on other plants and animals．Some are even living on you，on your skin，hair，and inside your body，in your mouth，nose，and all through your body．

    These tiny plants and animals are called microbes．The word microbe is made from two other words：micro，meaning small，and bios，meaning life．So，microbe means small life．

    Microbes have been on earth for a very long time．They may have been the first forms of life to be alive．Today there are more microbes in the world than all other living things．

    People did not know microbes had existed（存在） long．They were too small for them to see．But people did see many changes in their world﹣important changes．And they did not know what caused them．They saw food that they kept too long change color and begin to smell bad．They saw cuts and wounds grow red and painful and become worse. They saw old plants and leaves and trees crumble apart on the forest floor and disappear into the soil．Such changes were a natural part of the world，but people did not understand them．They did not know these changes were evidence(证据) of tiny plants and animals growing all around them.

    When he was nine years old, an American boy called Milo Cress had a question: How many plastic straws (吸管)do Americans use every day?

    He quickly learned there wasn't a simple answer. The boy tried to find it out himself. Through lots of research, Cress found out that Americans use about 500 million straws every day. In hopes of cutting down plastic waste, he founded the Be Straw Free project in 2011.

    Cress started the project in his hometown Burlington. Vermont. He asked a local restaurant to stop offering straws with every drink order. It was a simple change. However, it would save money. And by doing that, the restaurant would cut down on its straw use by 50 percent.

    For the year that followed, Cress tried to spread his project across the United States. More and more restaurants agreed to join. They stop providing the customer with a straw unless he or she asks for one. Last April, Seattle became the first American city to completely ban plastic straws.

    After his project became popular, Cress took his findings on the road. He has spoken to tens of thousands of students around the world. He wants to encourage more people to say no to plastic straws.

    "Focusing on straws is one simple step we all could take," Cress says. "And it makes me feel that I, as a kid, could make a difference, too."