1 . 阅读Section B 3a部分的文章，回答下列问题。
1. Besides being the largest, what is another notable characteristic of the blue whale mentioned in the text?
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2. What do blue whales eat?
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3. How does a dead blue whale contribute (贡献) to the ocean ecosystem?
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4. In which oceans can blue whales be found?
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5. Why does the author believe blue whales must be protected?
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2 .

7 . The Amazing Journey of Arctic Terns?

Arctic terns are small birds with a big adventure. Every year, they travel from the Arctic to the Antarctic and back—this is the longest migration of any animal on Earth. The round trip can be over 70,000 kilometers!?

Why do they make such a long journey? In summer, the Arctic is full of daylight, and there are plenty of insects for them to eat. They lay their eggs there. When winter comes, the Arctic gets dark and cold, so the terns fly south to the Antarctic, where it is summer and food is still easy to find.?

The journey is not easy. They must fly over oceans and deserts, facing strong winds and hungry predators. But Arctic terns are smart. They follow the sun and stars to find their way. They also fly in groups to stay safe.?

Scientists are amazed by these birds. Their bodies are built for long flights—they have strong wings and light bones. Even young terns can make the journey without their parents guiding them. This amazing ability has helped them survive for millions of years.?

阅读理解题?
1. How long is the round-trip migration of Arctic terns??

A．Over 7,000 kilometers.?	B．Over 70,000 kilometers.?
C．Over 700,000 kilometers.?	D．Over 17,000 kilometers.?

2. The underlined word “predators” in Paragraph 3 means ________ in Chinese.?

A．伙伴

B．天敌

C．同类

D．向导?

3. Why do Arctic terns fly to the Arctic in summer??

A．To avoid the hot weather.?	B．To find dark places to rest.?
C．To lay eggs and find food.?	D．To learn to fly long distances.?

4. How do Arctic terns find their way during the journey??

A．By following other birds’ sounds.?	B．By using the sun and stars.?
C．By remembering the mountains.?	D．By smelling the ocean winds.?

5. What can we infer from the passage??

A．Arctic terns are the largest birds in the world.?	B．Young Arctic terns need their parents to guide them.?
C．Arctic terns’ bodies are well-suited for long flights.?	D．The journey from the Arctic to the Antarctic is getting shorter.