Liu Yang, a professor at Sun Yat-sen University, is one of the country’s most famous bird-watchers, and has a sighting list of about 1,330 species (物种) of birds.

Since childhood, Liu has been interested in studying house swifts (家燕). He began his love for nature and wild life. During high school in 1994, he started his bird-watching journey. Since then, knowing all the birds he saw and keeping a record have become his goals.

Bird-watching for scientific research has always excited Liu. In the summer of 2008, while working at the Beishan National Farm in Qinghai, he came across birds that looked similar to a specie that normally appears in spring and autumn. Surprisingly, they were giving birth to the young. This discovery changed present knowledge, leading to the naming of two new species.

“Even though I have seen over 90 percent of the bird species in China, I still have met interesting bird behaviors in the wild that give birth to further research,” he says.

But research is just one side of his work. “Scientific research and popular science shouldn’t be seen separately. Your research questions come from nature and life, and the results should be made known to the public,” he explains.

As the writer of three books about birds, Liu has also given speeches and helped review the yearly report of the China Bird-watching Records Center. He hopes his work is good to both people and birds.

How beautiful spring is! Trees turn green and all kinds of flowers blossom. The wind blows gently. It reminds me of my trip to Beijing. I     1     (go) on a vacation to Beijing Wildlife Park last spring. It was my     2     (one) time visiting so many interesting animals. I saw some rhinos and egrets, They lived together and helped each other. What an amazing relationship they had! It really touched     3     (me) heart. I saw some tigers as well. Tigers are famous     4     their strength and courage. Some people hunt and kill them for money,     5     only few of tigers have survived. I was a little scared of tigers because they were     6     (danger). Jerboas (跳鼠) were much     7     (tiny) than some other animals. They looked like small     8     (mouse). They were hiding in the bushes. Pandas were so cute and they had fun     9     (eat) some bamboo. How happy the animals were! Animals are our friends and we should look after them     10     (good).

5 . This is a true story about some fishermen and a shark.

One day, three fishermen from Australia accidentally _______ a weak shark between some rocks. They saw that the shark had many fishing hooks (鱼钩) in ________ mouth. Then they decided to help it.

The fishermen recorded in a video how they worked to ________ the hooks from the shark’s mouth. “It has got six hooks in its mouth! Its mouth is cut to bits (碎片)! It must be very ________.” one of the fishermen said. As he worked quickly to take out the hooks, another man ________ the shark’s head in his arms and the third man put a strap (带子) around its tail so that it wouldn’t move.

Once all the hooks were taken out, the animal was ________ lifted from the rocks and put back in the water. The fishermen were ________ to see the shark swim away slowly.

The fishermen have since been called heroes for ________ the shark. “Wow! Well done, you guys! Thank you for ________ kind to the animal. You guys are amazing!” one person wrote online.

“The shark must know the men were helping him,” another person wrote.

Sometimes, ________ need our help although they are big and scary like sharks. We should be nice to them and help them as much as we can.

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9 . In a high mountain area in central Utah stands the world’s oldest, heaviest and largest tree, Pando. And it’s dying!

Pando means “I spread” in Latin and it’s a name that makes sense. Pando is a big group of trees that all grow from the same roots (根). They look separate but are all connected underground by their roots. With all these roots connected, the whole group of trees can share water and food.

________. In summer, animals (mule deer and cattle) feed on the new leaves, making it difficult for the trees to grow. The number of mule deer has even increased because their natural enemies (mountain lions, bears) have disappeared. The second problem is from people. Hikers and campers like this area because of the colorful leaves in autumn. But getting too close and stepping on the new growth has made Pando smaller and thinner over the last 50 years.

Protecting Pando is challenging. Putting fences (栅栏) around it to keep animals away has helped new growth. But deer are smart, and they’ve found ways to get through the fences. Other efforts have included cutting or burning part of Pando to encourage new growth. Pando grows back very quickly after a forest fire, and these fires do not reach temperatures that would kill its root system.

Michael Grant, one of the scientists who helped name Pando, warns if the trees are in trouble, the whole ecosystem will be in danger too. We need to make people understand the long-term effects of our actions.

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