Here is a story of the Baiji River Dolphin. It makes its home in the Yangtze River. Over 20 million years ago， the Baiji River Dolphin left the sea， swam up the Yangtze River and has lived there ever since. It has smaller eyes than other kinds of dolphins because the Yangtze River has many small pieces of earth in it. The small size helps to protect its eyes. However， because it has such small eyes， it cannot use its eyes to find food. Instead， this kind of dolphin uses sound waves（声波） to find food. This makes it so unusual.
About 2,200 years ago， there were thousands of dolphins in the Yangtze River， but today， not many people can see the dolphins. Their population has gone from thousands to about 150. Scientists say that the dolphin population has gone down because the population of people on the Yangtze River has gone up. They also say that the new dam（坝） on the river also makes the dolphins die because they don’t have food to eat.
Scientists have tried different things to save this “panda in the water”， but nothing has helped. What would you do to save this kind of dolphin if you had a chance？
（  ）6. The Baiji River Dolphin lives_________.
    A.in the Yellow River     B.in the Lijiang River
C. in the Yangtze River    D.in the Huaihe River
（  ）7. We can also call the Baiji River Dolphin“__________”.
    A. panda in the sky      B. panda on the Moon
    C. panda in the zoo      D. panda in the water
（  ）8. What makes the Baiji River Dolphin different from other dolphins？
    A. Its big nose.     B. Its small eyes.    C.Its small ears.     D. Its small mouth.
（  ）9. Why does the Baiji River Dolphin become fewer and fewer？
    A. Because the new dam on the river.
B. Because the population of people has gone up.
    C. Because it has smaller eyes.
    D.Both A and B.
（  ）10. What’s the best title of the passage？
    A. The Yangtze River.     B. The Baiji River Dolphin.
    C. Population problems.   D. The rising of population.

CDBDB