题目

下列生物中属于原核生物的一组是( ) ①蓝藻 ②酵母菌 ③草履虫 ④发菜 ⑤水绵 ⑥根霉菌 ⑦葡萄球菌 ⑧链球菌 A．①④⑦⑧             B．①②⑥⑧ C．①③④⑦             D．①②⑥⑦⑧   答案：A原核生物包括蓝藻、细菌、放线菌、衣原体、支原体等。酵母菌和根霉菌属于真菌(真菌分为酵母菌、霉菌和食用菌三类)。草履虫属于原生动物，原生动物属于真核生物。小球藻、水绵属于真核生物，蓝藻属于原核生物。发菜属于蓝藻，葡萄球菌、链球菌属于细菌。  根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。 选项中有两项为多余选项。Living with a roommate can be a great experience as many roommates become lifelong friends. However, roommates living together under the same roof for a long time unavoidably conflict with each other.【1】To prevent this from happening to you, each conflict should be addressed in a productive, healthy way.1. Set a time for discussion.Once conflicts occur, you need to set up a time to discuss the conflict.【2】They may think about any problems they want to discuss. It also allows for a better discussion as the both roommates will most likely enter the discussion fairly calm.2. Make rules for discussionBefore discussing the actual conflicts, set up some rules to guide the discussion. For example, each roommate is allowed to air one problem at a time and the other roommate has a chance to respond to it before another one is brought up. Making rules beforehand can prevent a screaming match from breaking out.【3】3.【4】You can use your discussion to point out to your roommates their great traits and specific things you like about them. While this won’t solve the conflict, it can help your roommates be more understanding of your point of view and more willing to compromise.4. Come up with a written roommate agreementOnce grievances（不满）have been aired by both parties you should develop a roommate agreement that is written down. This agreement should discuss what the rules are as well as what consequences exist for breaking them. For example, roommates having a conflict about overnight guests may compromise to allow overnight guests only on weekends with guests on weekdays being gone by 11 p. m.【5】A. Talk about your problems openly.B. Point out good things about roommates.C. Being honest can avoid unfriendly discussion.D. This provides both parties a chance for preparation.E. And disaster can strike when a conflict never gets settled.F. A consequence may be that the violator(违反者) pays $5 for breaking the rules.G. This is because both sides know they will have an opportunity to speak.