四、信息还原
A group of scientists finished a 10 - year project to count the number of tuna (金枪鱼) and other large fish in the world's ocean. 1. That is these fish are almost gone.
2. When there are fewer fish like tuna in the ecosystem, the ocean's food chain (食物链) will be broken. Animals and sharks may die as they can't find food—tuna.
Many people around the world get their protein (蛋白质) from fish. 3. Because of overfishing, almost ninety per cent of the world's large fish have disappeared (消失). And these large fish are the ones we usually eat.
Besides, the nets (网) we use for fishing also cause harm to the ocean. The bottom net is huge and heavy. 4. At the same time, it also catches much unwanted wildlife. Even worse, the bottom net hurts the ocean floor and destroys natural places. Plants and animals usually grow or live there.
Hearing the news, do you feel that it is urgent (急迫的) to protect the ocean? As students, we can also do our part to protect the ocean. 5. Years later, we can see different kinds of fish in the ocean.

五、完形填空
Aru Village lies by Lake Ra'og Co in Xizang, China. Many years ago, to keep their lake clean, people from the village used boats to go across the lake and 1 rubbish in the water. The villagers cared about the 2, so they kept doing this.
Later, a bridge was built 3 the lake, so villagers no longer needed to use boats to cross it. 4 the idea of cleaning the lake was kept. Tsering Dondrup, a village officer who used to go to school by boat, knew how the older villagers collected rubbish in the lake. He and other officers did a lot to help 5 the lake and its ecosystem.
The village has 43 families with 227 people now. A team of 44 people from the village are paid by the government to take turns to help keep the lake and 6 forests clean. They should also clean the roads and the area around the lake. They collect the rubbish and take it to the 7 place to be recycled (回收).
Dampa, a 46 - year - old man from the team, started doing the job in the lake about 20 years ago. "As part of this team, I can 8 about 3 500 yuan a year. I'm happy to do my part in keeping the lake clean," he said. Now, Aru Village has become a good 9 of ecosystem protection. Lake Ra'og Co has about 300 000 visitors every year. Village officer Xu Cong says the 10 of both the villagers and the government have helped keep the beauty of the area.
() 1. A. find out
B. pick up
C. fight with
D. depend on
() 2. A. environment
B. mountain
C. tradition
D. wild
() 3. A. under
B. in
C. over
D. through
() 4. A. So
B. And
C. Or
D. But
() 5. A. keep
B. protect
C. build
D. enjoy
() 6. A. nearby
B. far
C. thick
D. large
() 7. A. great
B. right
C. interesting
D. noisy
() 8. A. pay
B. save
C. lose
D. make
() 9. A. example
B. form
C. camp
D. field
() 10. A. goals
B. actions
C. programmes
D. abilities