七、閱讀測驗：        Salmon（鮭魚） are large river and sea fish. They begin to swim toward the sea after they are hatched（孵） in the upper creek（溪）or river. On their way there, they are getting stronger. Then salmon spend most of their life in the sea. It is the best place for them togrow up because there is a lot of food.       Having grown up, salmon swim back to their birth place thousands of kilometers away. They swim up rivers to lay eggs at the sameplace. They can still find the very river after leaving it for years.       Salmon are good swimmers. When they return to the upper river, they have to swim against the current. They may even come acrossfalls. They jump high over them.
【題組】41. We call salmon river and sea fish because ______.
(A) they lay eggs in the river and carry them to the sea
(B) they like to swim up and down the river
(C) they are good swimmers in the river or in the sea
(D) they live both in the river and in the sea