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

游客2025-02-02 30

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] Together ______ of Alaska fur seals swim down the Pacific Coast of North America.

选项 A、mothers and the young
B、fathers and the young
C、parents and the young
D、seals and whales

答案 C

解析细节题型。[注意本题容易选错]从文章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．中的划线部分可知，The females and young Alaska fur seal会从the Bering Sea(白令海—北太平洋的一部分)swim down the Pacific Coast of North America直到 southern California；而The males也会从白令海南下(因为These seals breed only in the Pribilot Islands in the Bering Sea．)，只不过他们没有the females and young走的远罢了。因此选项C为答案。

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