Forests of longleaf pine trees once covered two-thirds of the southeastern US. About 95% of those forests     1    （cut）since the beginning of the last century. But now these forests are returning.

The wood of the tree is very strong. Most buildings in the southern US used to contain longleaf pine wood. Today, after longleaf pine is no     2    （long） wanted to build houses, people are reusing the wood because it’s still good and resists water and insect damage. The tree is also     3    （value）to the environment since it stores CO₂ in its wood.

The US government has several programs to protect and expand longleaf pine forests, one of     4     is the Safe Harbor Program.     5     uses voluntary agreements with private landowners     6    （help）endangered animals. Now, farmers and landowners     7    （live）in the southeastern US are growing new longleaf pine trees. Instead of cutting the trees     8     wood, they are finding ways to make money from the forest of trees. One way is by selling the     9    （leaf）or needles of the trees as a ground cover. Another way is to sell hunting rights. Hunting wild pigs     10    （be） a popular sport in the southern US and the fight to hunt on land can cost from $200 to $1,000 a day.

A male elephant that broke away from the wandering elephant pack     1    ( send) back to its forest home on Wednesday in Xishuangbanna Dai Autonomous Prefecture, southwest China's Yunnan Province, local authorities said.

Yuxi City headquarters in charge of monitoring the pack's migration (迁徙) took the     2     (decide) early Wednesday morning     3     ( prevent) the lone animal from entering heavily populated areas. At 3 p. m.，the elephant was caught and returned to the nature reserve. The animal appeared     4     (health) and did not suffer from any injuries.

The pack of 15 wandering wild Asian elephants travelled about 500 kilometers north from their forest home. The male elephant separated from the pack on June 6, and moved around in the     5     (city) of Kunming, Anning and Yuxi, with an activity area of 140 square kilometers and a walking distance of 190 kilometers. It had relied mainly on     6     was provided by the locals. The     7    (remain) 14 elephants have been moving southward recently but are still far from the reserve.

Asian elephants are     8     A-level state protection in China, where they are     9     (most) found in Yunnan. Thanks to determined protection efforts in recent decades, the wild elephant population in     10     province has grown to about 300, from 193 in the 1980s.

It is reported that at present a city in Japan has a problem with graffiti(涂鸦). However, it is not the usual type of graffiti with paint from spray cans     1    (use) to write on walls. It is graffiti in sand.

Officials in the city of Tottori are asking tourists to give up     2     (write) messages and drawing pictures in the sand of its giant sand dunes (沙丘). The officials say the graffiti causes damage to the dunes,     3     destroys the pleasure others get in looking at the sand.

More than 3,300 cases of "sand graffiti"     4     (occur) at the tourist spot in the past decade. In January, two overseas tourists were ordered     5     (erase) a 25-meter-long message that read "Happy Birthday Natalie".

The Tottori Sand Dunes are famous throughout Japan     6     their natural beauty. They are the largest and longest sand dunes in the country and form part of     7     scenic coastal park on the sea of Japan coast. The biggest dune is 50 meters high.

The local government wants to improve tourists' understanding of the     8     (important) of the dunes. It will set up much     9     (many) signs in English, Chinese and Korean asking people to respect the dunes. A spokesman said, "We are concerned about whether the rules are     10     (complete) understood, and we want to continue to protect views of the beautiful sand dunes."

World Environment Day (WED) ,     1     is observed on June 5 every year, is one of the most unique and special holidays because     2     its history and its many firsts. Created on the first day of the first-ever UN conference , WED focuses on humans and the environment.

However, this didn't happen overnight. Sweden first suggested     3    (have) such a conference in 1968.

And in 1969, the UN agreed that in three years they would have a conference in Sweden that focused on     4    (globe) environmental problems.

Finally, it all came together in 1972. Leaders from around the world     5    (sit) together to discuss how they could raise awareness to protect our environment — and it was then that WED was made. Then two years later, the first-ever WED     6     (celebrate) with the slogan(口号)“Only One Earth”.

Ever since then, WED has been     7     (complete) accepted by people everywhere. Many famous people around the world all encourage people, in their own unique way,     8    (do) their part and save the world.

So, it doesn't matter if you’re a famous actor, an athlete     9     a student in college: gather your friends and spend a day outdoors doing fun     10    (activity) towards protecting this beautiful planet. You'll have great fun and feel much better afterward.

How much do you know about the Amazon rainforest? It is without doubt one of the true    1    (wonder) of the world. The Amazon rainforest is of great    2    (important) because it is home to thousands of animals, birds and insects.

The Amazon rainforest is in South America,    3    (cover) most of the Amazon basin of South America. It travels across 9 different countries.    4    (actual), the Amazon rainforest is the    5    (large) rainforest in the world and it has been around for at least 55 million years, Many of the medicines that we use today are from plants in the rainforest.    6    , about 2.7 million acres(英亩) of the rainforest    7    (ruin) each year, which is bad for everyone as forests and trees help to keep our air clean. Scientists think that if climate changes are to increase the world's temperature    8    only 3℃, then 75% of the Amazon rainforest will be destroyed. If all the forests continue to be cut down, 137 rainforest species will be destroyed every single day! That is    9    (frighten). The Amazon rainforest is a very precious place on Earth, and we    10    protect it to make it survive for years to come.

6 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式,并将答案填写在答题卡上。

Human activity is changing the surface and temperature of the planet. But new research shows it is also changing the sound of the Earth's oceans and seas. According to a study    1     ( publish) in the magazine Science, the changes in the sounds of our oceans, seas, and other waterways affect many sea animals.

For fish, sound is probably a    2     (good) way to sense their environment than light. Sounds help fish and other sea animals survive.     3     depend on sounds for communication. Sounds also help some sea animals find food and avoid their hunters.     4     addition, many sea animals use sounds to find good places to mate. However, increased noise from humans    5     (be) making it harder for these sea animals to hear each other. The noise comes from shipping traffic, motorized fishing ships, underwater oil and gas exploration ,offshore     6     (construct) , and other noisy human activity.

For many sea species, their attempts to communicate are being masked by sounds     7     have been introduced by humans. Also, the general number of sea animals     8     (decrease) by about half since 1970.

Effects of noise on animals     9     (live) in the seas aren't well understood. However, some studies suggest that noise may bring about hearing loss. The stress from human noise might also affect the immune system-an animal's    10     (nature) defense system.