请看下面这些生物：草、蛇、蘑菇、兔、猫头鹰、蜘蛛、食草昆虫、青蛙、蚯蚓、树、狐、鸟
（1）利用这些生物，写出两三条食物链：
______；
______；
______；
（2）食物链中，生物之间的关系是：______
（3）这些食物链彼此交错连接，形成了______
（4）生态系统中的______，就是沿着食物链和食物网流动的．
答：（1）题干中生产者只有草和树，其余的有消费者和分解者，根据生产者与消费者之间的吃与被吃的逻辑关系可以写出食物链．
（2）食物链是在生态系统中生产者和消费者之间存在的吃与被吃的关系
（3）多条食物链交织在一起就形成了食物网．
（4）生态系统中的能量和物质随着食物链是逐级减少的．
故答案为：（1）草→兔→狐；
草→食草昆虫→青蛙→蛇→猫头鹰；
草→食草昆虫→蜘蛛→鸟→猫头鹰；
（或：草→食草昆虫→鸟→猫头鹰；
草→兔→猫头鹰；
草→食草昆虫→鸟→蛇→猫头鹰等）
（2）吃与被吃
（3）食物网
（4）物质和能量
Italian Lakes and Greek Islands (12 Days) Your tour begins in Milan, Italy(意大利), and moves on to the pretty Italian Lake District and the attractive resort(胜地)of Stresa, your home for two nights. Collette Vacations has carefully chosen the Costa Victoria as your home for your 7—night journey along the waterways of the Mediterranean. The cruise ship is filled with the warmth and culture of Italy and is richly designed with entertainment(娱乐)areas and very good living conditions. It will take you to the places of your dreams. You’ll spend 4 days touring Greek cities you’ve always heard about. In Katakolon, you will have an exciting tour to nearby Olympia without a guide. Then with a local guide you will visit the Greek islands of Santorini, which is often related to the story of the lost city of Atlantis, and Mykonos, a wonderful island with beautiful beaches. Your journey ends in Verona, home of the love story Romeo and Juliet, with a fun—filled Goodbye dinner—a perfect ending to a pleasant journey. 12 Days, 25Meals: 10 Breakfasts, 6 Lunches, 9 Dinners Day 1 Overnight flight to Italy Days2—3 Regina Palace, Stresa, Italy Days4—10 Costa Victoria ( Costa cruises) Day 11 Hotel Leopardi, Verona, Italy Day12 Leave for home Please Note:
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