Some people associate migration mainly with birds. Birds do travel vast dist

游客2025-02-02 29

问题 Some people associate migration mainly with birds. Birds do travel vast distances, but mammals also migrate. An example is the caribou, reindeer that graze on the grassy slopes of northern Canada. When the weather turns cold, they travel south until spring. Their tracks are so well-worn that they are clearly visible from the air. Another migrating mammal is the Alaska fur seal. These seals breed only in the Pribilot Islands in the Bering Sea. The young are born in June and by September are strong enough to go with their mothers on a journey of over 3,000 miles. Together they swim down the Pacific Coast of North America. The females and young travel as far as southern California. The males do not journey so far. They swim only to the Gulf of Alaska. In the spring, males and females all return to the islands, and there the cycle begins again. Whales are among the greatest migrators of all. The humpback and blue whales migrate thousands of miles each year from the polar seas to the tropics. Whales eat huge quantities of plankton. These are most abundant in cold polar waters. In winter, the whales move to warm waters to breed and give birth to their young. [br] The phrase "An example" underlined in Paragraph 1 refers to an example of a ______.

选项 A、migratory mammal
B、place where animals migrate
C、migrating bird
D、person who associates migration with birds

答案 A

解析细节题型。见上题分析，第二、三句提到哺乳动物也迁徙；其中一个例子是……。当然这个例子应是指迁徒的哺乳动物了。所以选项A是答案。

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