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1. Salmon spend most of their adult lives in salt water, despite they return to their freshwater birthplaces to spawn and die.(1)____
译文：成年鲑鱼大部分时间生活在盐水湖，但是它们产卵和死亡时都会游回至淡水的出生地。
2. Perspiration, the body's built-in cooling mechanism occurs as a natural reaction to nervousness, intense heat, or vigorously exercise.(2)____
译文：排汗是身体的内置冷却机制，当人在紧张、酷热以及剧烈运动时，排汗就会作为一种自然反应发生。
3. Because of the rising cost of fuel, scientists are building automobile engines who will conserve gasoline but still run smoothly.(3)____
译文：因为燃料价格的不断上涨，科学家们正在制造一种能节省石油却又运行平稳的汽车发动机。
4. One of the wildest and most inaccessible parts of the United States are the Everglades where wildlife is abundant and largely protected.(4)____
译文：美国大沼泽地是美国境内最为荒凉和最难以进入的地区之一，此处有大量的野生动植物而且大多受（法律）保护。
n. 蜜饯，果酱
vt. 保存，与糖放在一起，
