VI. Choose the correct answer (A, B, C, or D) to complete the following passage.
Nowadays people are more aware that wildlife all over the world is in danger. Many species of animals will become extinct if we do not (46)      __       an effort to protect them. There are many reasons for this. (47) ______  some cases, animals are hunted for their fur or for other valuable parts of their bodies. Some birds, such as parrots, (48) ______  alive and sold as pets. For many animals and birds the problem is that their habitat - the place where they live - is disappearing. More land is used for farms, for houses or industry, and there are fewer open spaces than there once were. Farmers use powerful chemicals to help them to grow better crops, (49) _______  these chemicals pollute the environment and harm wildlife. The most successful animals on earth - human beings - will soon be the only ones left, unless we can (50) _______  this problem.
(47)
A.In 
B.To
C.For
D.With

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Read the passage carefully, then choose the best answer for each question.
THE LOST CITY OF ATLANTIS
Most people have heard the story of the lost island of Atlantis. But is any part of the story true?
Over two thousand years ago, the Greek writer Plato wrote about Atlantis, an island in the Atlantic Ocean. The island's people were very rich. They built a big city with many great buildings. At the center of the island, they built a beautiful golden temple.  But the people became greedy—they had many things, but they still wanted more. So the gods became angry, and the island was struck by earthquakes  and very large waves. Finally, the whole island sank into the sea.
Many explorers have looked for Atlantis. In 2004, explorer Robert Sarmast reported finding the remains  of a city under the sea near Cyprus. However, Sarmast and other scientists later found out the structures he found under the sea were natural, not man-made.
Many people think Atlantis is simply a story. The purpose of the story is to teach people not to be greedy. Richard Ellis wrote a book about Atlantis in 1999. He says "there is not a piece of solid evidence''  for a real Atlantis.
So was the island real or not? We only know one thing: The mystery of Atlantis will be with us for a long time.
What is the main idea of the third paragraph?
A.Scientists found out the structures were natural.
B.Explorers found a city under the sea near Cyprus.
C.People are looking for Atlantis, but no one has found it.
D.Only one explorer has looked for Atlantis.