题目

汤飞凡先生长期从事传染病及疫苗研究，是世界上首位分离出沙眼衣原体的科学家。沙眼衣原体是一类独特的原核生物，有较复杂的、能进行一定代谢活动的系统，但不能合成高能化合物，下列说法正确的是（ ） A．沙眼衣原体是独立的生命系统，其系统的边界是细胞壁 B．沙眼衣原体能在无细胞的培养基中繁殖 C．沙眼衣原体细胞内具有核糖体结构 D．沙眼衣原体具有完整的核膜结构根据短文内容，回答下列问题。 One day an old man sells(卖) a big elephant. A young man comes to the elephant and begins to look at it slowly(慢慢地). The old man goes up to him and says near his ear. “Don’t say anything about the elephant before I sell it, then you can get some meat.”“All right.”says the young man. After the old man sells the elephant, he gives the young man some meat and asks, “How can you see the bad ears of the elephant?”“I don’t see the bad ears，”says the young man. “Then why do you look at the elephant slowly?”asks the old man. The young man answers, “Because I want to see what an elephant looks like.” 1.What does the old man sell? ____________________________________________ 2.Does the young man want to buy the elephant? ____________________________________________ 3.What does the young man get at last(最后)? ____________________________________________ 4.Does the elephant have two bad ears? ____________________________________________ 5.将文中划线的句子译成汉语。 ____________________________________________