问题
选择题
下表是几种生物体内农药含量的测定结果，这些生物之间存在着吃与被吃的关系。请分析下列哪一条食物链可能是正确的
A．A—B—C—D—E
B．E—D—C—B—A
C．D—A—B—E—C
D．C—E—B—A—D
答案
答案：D
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下表是几种生物体内农药含量的测定结果，这些生物之间存在着吃与被吃的关系。请分析下列哪一条食物链可能是正确的
A．A—B—C—D—E
B．E—D—C—B—A
C．D—A—B—E—C
D．C—E—B—A—D
答案：D
Brian is my good friend. He has a five-year-old daughter, Lydia. Lydia likes animals very much and always 1 to have a dog. This Sunday is Lydia's birthday. Brian wants to buy 2 a dog. So he goes to the 3 near his home. He says hello to Paul, the owner（主人）of the store. Paul says hello to him, too. Brian says, "This is a clean and 4 pet store." Then he walks around the store. 5 he doesn't see any pets. "Excuse me. 6 are the pets?" he asks. "The pets are right here," says Paul. Then Paul 7 him a catalog（目录簿）. Brian sees 8 pictures of pets in it, like dogs, cats and birds. "You only need to 9 me the pet you like," says Paul. "We can mail（邮寄）it to you." "What if I don't like it?" asks Brian. " 10 mail it back," says Paul. "Oh, sounds interesting," says Brian.
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