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0331托福綜合寫作的閱讀:
Hooligans太平洋細齒鮭數量減少了,有以下三個原因。
1. Upperstream dam 限制了水流,沒有sand和gravel來附著產出的卵。
2. By catch,漁夫捕魚的時候順便把Hooligan抓了(fishers use nets to capture shrimps and hooligans will be caught by accident in this way)。
3. 其他魚,比如hake游進來跟Hooligans競爭食物。
0331托福綜合寫作的聽力:
這三種原因都有解決方式。
1. Temporary adjustment Hooligans only hatch in spring, so we can let more water go through dams to carry more sands and gravel;
2. Use a small bright light along the rivers which the hooligans are sensitive to but the shrimps are not;
3. Add more food, like krill (這是the Pacific hake和hooligan共同的食物) into rivers for hooligans by humans,這樣就能減緩食物競爭。
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