1 . 阅读下面文字，在空白处填入1个适当的单词或括号内单词的正确形式。

A national park such as Sarek National Park and the Yellowstone Park is entirely different from a common park you visit in the city. In a national park,     1    (keep) its natural state is one of the most crucial     2    (objective). Besides, all new development is banned so that the national park will always remain     3    it is, natural and beautiful.

2 . 阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写 1 个适当的词， 在给出提示词的空白处用括号内所给词的正确形式填空。

Mount Qomolangma,   or Mount   Everest,   is   the world's     1     (high)   mountain above sea level. Boasting unique Tibetan cultural heritage and natural scenery, the Qomolangma National Nature Reserve protects 3.381 million hectares of the central Himalaya in the Tibet autonomous region. It’s a natural area for rare animals including Tibetan antelopes, wild yaks and black-necked cranes     2     (live) in. This year marks the 60th anniversary of the first     3     (success) expedition to Mount Qomolangma, and the 45th anniversary of China’s first accurate measurement of Qomolangma’s height.

3 . 阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写一个适当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

Amateur explorers have found what may have been the last undiscovered island on Earth. The island is round and about three quarters of a mile wide. It sits in the northern Pacific and is a place     1     it’s neither too hot nor too cold. It’s almost completely flat and rocky. The island’s only distinguishing feature is a slight hill on the eastern side. After spotting the hidden piece of land in     2    first looked like an e-map fault, the group of friends     3    (set) out in a boat to confirm what they’d found. They’re now running an online contest to name the island.

4 . Mars on Earth

Devon Island has always been a cold and uninhabited(无人居住的) place in the Canadian Arctic. Day after day there are high winds and the temperature is below freezing. But for the first time, despite the terrible weather conditions, Devon Island is the new home for a group of explorers from NASA. They are living here for a few months in order to train and learn how to live and work on Mars. The group’s members come from various backgrounds and nationalities, but they all have the same purpose: to find out how people can live on Mars in the future.

They have chosen Devon Island because the environment and landscape is similar in many ways to Mars. The surface is freezing cold and the ground is rough. However, there are some differences on Mars, where the atmosphere is poisonous to breathe. Devon Island is easier to travel to and it has its own dangers that you won’t find on Mars. For example, you might meet a hungry polar bear on Devon Island!

One thing the team wants to develop is suitable clothing for Mars. This includes a space suit. The suit they are testing at the moment is strong enough but it’s too difficult to put on and take off. It’s very big and bulky, which means that just walking around is very difficult and tiring. In addition, people will need to do experiments on Mars while wearing the suit so they have to be able to move around easily. One team member, Andy Overbeeke, specializes in space suit engineering. He explains, “You have to think about what they’re really going to operate in.”

Another part of daily life on Mars will be meals and food. Creating a new home on Mars requires a lot of food. So the big question is: can you grow plants in order to survive? Scientists believe that growing plants on Mars might be possible. Mars and Earth have many similarities. They both have about the same amount of dry land and a 24-hour day. However, the atmosphere on Mars is totally different, so Canadian scientist Alain Berinstain is attempting to grow plants in a special greenhouse that you could also build on Mars. The greenhouse needs to run 365 days a year, so it uses a combination of solar energy and wind power.

People living on Mars will also want their own transportation. For this, the team on Devon Island have built the “Martian Rover”. It’s a huge heavy vehicle that can travel over rocks and rough terrain. This kind of testing takes many days but so far the work has been valuable and effective. As a result, the whole team now believes their work is crucial and that it’s possible for humans to land on the planet Mars and create a home there. Addy Overbeeke adds: “We know that it’s man’s destiny to go out and do space exploration. It’s always time to think about what you want to do in the future.”

1. The explorers are living on Devon Island to ________.

A．receive a training in astronomy

B．set up an advanced research lab

C．learn how to live and work on Mars

D．make a living in an uninhabited land

2. To keep food supply on Mars, people should ________.

A．create a new home

B．improve the atmosphere

C．build special greenhouses

D．reduce the area of dry land

3. According to the passage, we know that ________.

A．man may live on Mars in the future

B．Martian Rover has failed to stand the test

C．Mars and Devon Island have the same soil condition

D．scientists have mastered the method to grow plants on Mars

5 . Last year the empty land across from my bus stop was a sad, empty, ugly space, with dead bushes and one short tree. Then some    1     (gardener) changed that. They were tired of looking at the sad space while they were waiting    2    the bus, so they made it into a beautiful garden. Now you can see colorful vegetable plants and sweet-smelling flowers. Yellow butterflies fly from plant to plant    3     (happy), and tiny birds sing in the green trees. I love taking the bus now.