题目内容
赤潮是海水富营养化的结果。( )
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生物地球化学循环中沉积型循环与全球性三个环境问题(温室效应，酸雨、酸雾，臭氧层破坏)密切相关。( )
Thanksgiving Day is the most truly American of the national holidays in the United States and is most closely connected with the earliest history of the country. In 1620, the settlers, or Pilgrims, sailed to America on the May Flower, seeking a place where they could have freedom of worship. After a two-month voyage, in icy November, they landed at what is now Plymouth, Massachusetts. During their first winter, over half of the settlers died of starvation or epidemics (流行病). Those who survived began sowing in the first spring. All summer long they waited for the harvests with great anxiety, knowing that their lives and the future of the colony depended on the coming harvest. Finally the fields produced a yield rich beyond expectations. And therefore it was decided that a day of thanksgiving to the Lord be fixed. Years later, President of the United States declared the fourth Thursday of November as Thanksgiving Day every year. The celebration of Thanksgiving Day has been observed on that date until today. The pattern of the Thanksgiving celebration has never changed through the years. The big family dinner is planned months ahead. On the dinner table, people will find apples, oranges, chestnuts, walnuts and grapes. There will be plum pudding, mince pie, other varieties of food and cranberry juice and squash. The best and most attractive among them are roast turkey and pumpkin pie. They have been the most traditional and favorite food on Thanksgiving Day throughout the years. When does Thanksgiving Day fall
酸雨是燃烧化石燃料排放到大气中的氮氧化合物随雨水降到地面形成的。( )
臭氧层能阻挡红外线对地球的照射。( )
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