Earth Day is an event    1    (annual) celebrated on April 22.     2    (found) by Senator Gaylord Nelson, an American politician and environmentalist, it was originally aimed at helping the public to know the current situation of air and water pollution and    3     (get) people to care about the earth.

In1962, Rachel Carson’s bestselling book “Silent Spring” created an    4    (aware) of the dangerous effects of pesticides (农药) . Then, a fire,     5     broke out in 1969 on Cleveland’s Guyahoga River, shed light on the problem of chemical pollution in water. Senator Gaylord Nelson dreamed of    6    similar large event that would get people to take environmental issues seriously. In 1969, he was inspired by protests against the Vietnam War and came up with the idea for Earth Day.

In the fall of 1969, Nelson announced it and appealed to the entire country to get involved. Consequently, telegrams, letters and telephone calls    7    all over the country poured in. Since 1970, Earth Day celebration have grown. Later, Nelson    8    (award) the Presidential Medal of Freedom in recognition of his work.

Today, Earth Day is celebrated around the world every April 22. Sometimes numerous communities celebrate Earth Week, an entire week of    9    (activity) focused on the Environmental issues. In 2017, the March for Science    10    (occur) on Earth Day(April 22, 2017) and was followed by the People’s Climate Mobilization (April 29, 2017).

2 . 阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。

I can well remember that I was once asked to deliver a speech titled “A Real Test in My Life” before the whole class at the age of 9! You can imagine how     1     (terrible) shy I was with so many eyes       2       (fix) upon me. I had no     3     (choose) but to prepare for it, though. First of all, I was to draft the speech, which was just a piece of cake for me, a good writer. But the hardest part     4     (lie) in my oral presentation from my memory— for to read from the paper was not allowed. The real moment began     5         I stood on the platform with my legs trembling and my mind blank. But my listeners were waiting patiently without any signs of rushing me. Gradually I found myself back,     6     (deliver) my speech with difficulty. After what seemed to be a hundred years, I found my audience applauding— I made     7    ! From then on, my fear of talking before an audience disappeared. Actually with my     8     (confident) building up, I now turn out to be a great speaker. Looking back, I know the greatest difficulty on our way         9     success is our fear. Overcome it     10     we will be able to achieve our goals.

Some people are great at remembering faces. While, for some people, remembering a face can be difficult. Even for others, remembering a face may be impossible. Such people have a condition    1    (call)“face blindness”. Its actual name is Developmental Prosopagnosia, or DP    2    short.

Experts say DP can differ    3    (great)from patient to patient. In less severe cases, people are unable to describe the face of someone they have just met. In severe cases, people cannot even recognize    4    (they)own children in a group photo.

Those,    5    have DP, show no clear signs. Take Dacia for example. If you met her, you probably wouldn’t know that she suffered brain damage as a child. There would be no sign of it until you meet her    6    second time. She wouldn’t remember you at all. Dacia has mostly recovered from her    7    (injure). But now, she suffers from face blindness.

Once face blindness    8    (think)to be very rare. But recent    9    (study)have shown that it might be more common than experts thought. The study on face blindness will not directly lead to any treatments. However, it could lead to a much    10    (deep)understanding of how we all remember the world around us.

As you know, science plays     1    very important role in our education. Do you want to keep up    2    the latest research and discoveries in science? There are many good websites     3    you can check out the latest in the science world.

One great site is Science News for Kids. This site reports science news     4     (cover) a wide range of subjects. The articles are intended for younger readers, but adults will find this site     5     (suit) for them as well. Another wonderful site, one that I check out every day,     6     (call) Science Daily. The site is    7     (constant) updated with news, often about exciting    8     (find) that change how we view the world.

These sites post the latest stories and also keep all the past articles they    9     (post) earlier. That way you can find articles just about anything that    10     (be) related to the science fields you are interested in.

Pioneering underwater photographer David Doubilet is a master craftsman,     1    combines technology and capture (捕捉) life underwater,         2    (bring) images back to the surface for those who might never see those sights with their own eyes. Entering the sea as a journalist, artist, and         3     (explore), Doubilet documents both the beauty and the   devastation (破坏) in our oceans.

He believes that the photography has the power         4     (educate), and influence change. Doubilet is deeply concerned about the future of the oceans. When he     5       (ask) what sort of powerful stories he’d like to tell through his work, he says, “Right now, we’re   telling the most     6    (meaning) story in the world. Doubilet and his wife, Jennifer Hayes, are working on a National Geographic project     7     (name) “Coral Status, the Science and the Future”.

They are looking at coral worldwide to see how it’s changed, and changing. “A lot of climatologists are thinking coral may be one of     8     greatest indicators (指示者), the thermometer of the health of this planet. We’re looking at reefs that are thousands     9    years old, and in the last four and five years they have     10    (complete) died. That’s what happens when you have a warming ocean.

I was excited to take my rescue Beagle（比格犬）to the river the other day, as it's within walking distance of our new home.     1    (spend)her first three years in a cage, Georgie had never seen a body of water, and I wanted to get there before sunset to watch her experience it.

I was growing     2    (increasing)impatient about all the stops her little Beagle nose required. She inspected the grass, dirt, and trees, and licked whatever    3    (stick)to the road. These were all new    4    (discover) for her, and she took her time studying them.

When I accepted that it was fruitless to hurry her along, I whipped out my cell phone and began texting. I thought that I needed something to do while Georgie was slowing us down. Then,     5    some reason, I heard the cicadas （蝉），and I remembered that the sound of cicadas is my favorite sound in the world. That awakened something    6    (bury)within me that longed for the simple pleasures    7    had been replaced by technology.

I made a    8    (consciousness)decision to be present, and to enjoy the journey to the river Just like Georgie. Now, I admired the flowers and the winding ivy（常青藤）on our path. I smelled the grass and the flowers, and the dirt and the air. I treasured each one equally, as if discovering them for the first time.

As we neared our destination, 1 realized something even    9    （much）important: It didn’t matter if we even reached the river, Why must there always be a destination? Georgie had no idea that we had a destination. She was present for the journey, and she completely enjoyed every bit of that sweet experience. There was no race    10     no finish line.

Now I’m not sure who rescued whom.

Over the past ten years I     1    (travel)abroad and home has become more of a feeling     2     a place. So     3     is important that I can celebrate the new year with the loved ones. New Year’s Eve has become the only time to reconnect with my friends which makes me feel at home. Every year we try     4    (unite)wherever we are and remember the time when we knew each other.     5    , a lot of people feel that New Year’s Eve can’t live up to     6    (expect). Ideas such as the New Year’s kiss and resolutions create much pressure for people to have     7     night to remember,     8    will change their lives and perhaps make the next year worth     9    (live). I think those people are missing the point.     10    Christmas is about family, why can’t New Year be about friends?

While working for a department store in Manhattan, Bob decorated the huge Christmas tree. It turned out to be     1     attracted the shoppers most. He decorated the tree so     2     (beautiful) that many people praised him,     3     (include) the actress Mia Farrow.

Bob mentioned this several times during our first few     4     (discussion). Then one day, he added, “I love decorating for Christmas very much,     5     I have no confidence in making a living at it.” “Why don’t you have a try?” I asked. I explained     6     Bob that starting his own Christmas decorating business matched up well with his desire for the     7     (free) to set his own hours and workload. “You love Christmas, and you love being independent; why not organize your life around those two loves?” Within a year, Bob established a brand as Dr. Christmas, and till now his business     8     (grow) to also providing holiday decorations for movies and television shows.

During my first discussion with Bob neither of us expected     9     (he) future success. So anything is possible! As Bob says, ‘‘Just remember     10     (shape) your life as a game of your own design.”

Finding a New Spring

A tradesman was leading a caravan（商队）to another country    1    （sell） his goods. Along the way they came to the edge of a severe hot-sand desert. They learnt that during the daytime the sun heats up the fine sand until it's as hot as charcoal, so no one can walk on it--not even bullocks（小公牛）or camels! So the caravan leader hired a desert guide, one who could follow the stars, so they could travel only at night when the sand cools down. They began the dangerous night-time journey across the desert.    2    couple of nights later, after eating their evening meal, and waiting for the sand to cool, they started out again.

Later that night, the desert guide,    3    was driving the first cart, saw from the stars that they were getting close to the other side of the desert. He had also overeaten, so that when he relaxed, he fell asleep. Then the bullocks who, of course, couldn't tell    4    （direct）by reading the stars,    5    （gradual）turned to the side and went in a big wide circle until they arrived at the same place they had started from! By then it was morning, and the people realized they were back at the same spot. They lost heart and began to cry about their condition. Since the desert crossing was supposed to be over by then, they had no more water and were afraid they would die of    6    （thirsty）. They even began to blame the caravan leader and the desert guide.

However, the leader    7    （he）didn't lose courage. He began walking back and forth,    8    （try）to think out a plan. Remaining alert, out of the corner of his eye, he noticed a small clump of grass. He thought,“    9    water, no plant could live in this desert.” So he asked his fellow travelers to dig up the ground on that very spot. They dug and dug, and after a while they got down to a large stone. He got down into the hole, put his ear to the stone, and heard the sound of flowing water.

A spring    10    （find）. All the people were overjoyed.

Dogs, just like humans, can get cold when the temperature starts to drop. We can wear coats or hats, but dogs don't really have them     1     they just refuse to wear them. If you live in a cold climate, it will be important     2     (know) your dog's limits and how you can keep them safe and warm.

Actually, when it is too cold for dogs to go outside heavily depends upon the dog's size, coat     3     (thick), color and other     4     (factor), but in general, when the temperature hits below 32 degrees Fahrenheit (华氏温度), dogs can actually start to get hurt from     5     cold.

In many parts of the world, the temperature     6     (remain) below 32 degrees for several months at a time. Since dogs     7     (obvious) can’t stay inside all day during the winter season, the most important thing to remember is to pay attention to your dogs when you take them out. They will typically let you know if they are not     8     (comfort).

If your dog isn't a breed (品种) that can bear the cold well,     9     (get) them a coat can be helpful. Make sure that the coat is warm but still allows your dog to have a full range     10     motion.