题目

生物圈中已知的植物有50余万种，它们形态各异，分属不同类群。下列关于几种植物的叙述，正确的是（） A . 卷柏、侧柏都通过产生种子进行繁殖 B . 海带、地钱都依靠叶进行光合作用 C . 雪松、油松的果实通常称为“球果” D . 银杏、杏都靠种子繁殖后代 答案：D Every country has its own special customs. 45. Americans feel that the first rule of being a polite guest is to be on time. If a person is invited to dinner at six thirty, the hostess expects him to be there at six-thirty, or not more than a few minutes late. When the guest cannot come on time, he calls his host or hostess on the telephone, gives the reason, and tells at what time he can come. 46. 有时候，客人应该带一盒糖果或一些鲜花给女主人。As guests continue to arrive, it is usually considered polite for the men in the group to stand when a woman enters the room. When the guests sit down at a dinner table, it is customary for the men to help the ladies by pushing their chairs under them. 47. There is a difference between American and European customs in using the knife and fork. Europeans keep the knife in the right hand, the fork in the left. They use both hands in eating. Americans, on the contrary, use just one hand whenever possible and keep the other one on their lap. If for any reason a guest has to leave the table during a meal, he or she should ask the hostess. “Would you please excuse me for a minute?” 48. 没有告诉女主人就离开是不礼貌的。Following dinner, guests usually stay for two or three hours, and most dinner parties breakup at about 11 o’clock. 49. As the guests leave, it is the custom to thank the hostess for a very pleasant evening. One may say anything that expresses appreciation. Common expressions are: “Goodbye. It was so nice of you to have me,” or “Thank you. I’ve had a very nice time.”1._________________________________________________________________________2._________________________________________________________________________3._________________________________________________________________________4._________________________________________________________________________5._________________________________________________________________________