問題詳情

      Some animals have the ability to find their way home after making distant journeys, Salmon, forexample, 65 in freshwater streams and soon afterwards journey down to the sea. Several yearslater, after they 66 maturity, they swim back upstream to spawn and, in many cases, 67 . Theparticular stream that serves as the journey’s end is almost invariably the same one 68 they wereborn. Scientists have discovered that the salmon, like many other fish, have an acute 69 of smelland are able to remember slight differences in the chemical composition of water. The most reasonabletheory to 70 salmon homing is that each individual remembers the distinctive “fragrance” of itsnative stream. As it moves upstream it makes the correct choice each time a new tributary isencountered until finally it arrives home.
65
(A) born
(B) is born
(C) are born
(D) were born

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