(单选题)
Adult salmon swim back to the river because ______.
A.they won’t be eaten by other big fish
B.they want to lay eggs in a safer place
C.they are getting ready to die there
D.they want to go where they grew up
参考答案：B
参考解析：
细节理解题。根据第五段倒数第二句“Salmon do this, because their eggs are safer in the river”可知，成年金鱼回到出生地产卵是因为河水里更安全。故选B。
知识点：阅读理解四选一 英语专业基础知识 阅读理解 教师招聘-小学 英语
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