题目

(Sally and Tina are talking about their reading.)Sally：Hi, Tina. What are you reading?Tina：A Brief Introduction of Time (时间简史) by Stephen Hawking.Sally：I have heard of this book, too.【1】Tina：It’s about time, space and future.Sally：What does he think the future will be like?Tina：【2】 There won’t be any other planet, either.Sally：Really? His book is really interesting. After reading it,【3】Tina：Oh, no. I just read the book for fun.Sally：【4】Tina：I want to be a teacher.【5】Sally：Hope your dream can come true. A．What is it about?B．Well, he thin右图示南极海域的一个食物网，请据图回答问题： （1）该食物网中共有食物链_________________条，其中，最长的食物链有_________________个营养级。 （2）在不同食物链中占有不同营养级的动物有_________________。 （3）企鹅每增加1kg重量，至少需要____________kg的大鱼；所消耗的浮游植物至少有____________kg. （4）由于DDT等农药污染了环境，该海域体内积累有害物质最多的生物是_________________，主要的原因是: ____________________________________________________________________。