*现在完成时
1.I have sat for hours in the classroom,reading a novel.
2.The weather has been cold so far this winter.
3.I haven't finished my homework yet.
4.He has just come.
5.Has he visited the city twice?
6.Haven't seen you for a long time!
7.We haven't heard from her since last week.
8.He has always said so.
9.They've been to Beijing twice.
10.--Where shall I say you have gone if Li Ping asks for you?
--Say that I have gone to Beijing.
*过去完成时
1.I had stayed in Beijing for three years by then.
2.Until then he had known nothing about it.
3.The boy told his mother that he had been ill since he came back from the school.
4.She had only been here for ten minutes when Jim came in.
5.When they got to the field,the football match had already started.
6.He had learned two hundred English words by the end of last term.
7.He said he had learned two hundred English words by the end of last term.
8.He said he had seen the film twice.
9.I had hoped to be able to take my seat in all this noise without being seen,but that morning the room was quiet and orderly.
10.After he finished his homework,he went to bed.
在中国的神话世界中六界分别指的是神界、仙界、人界、妖界、魔界以及冥界。然而在道家中六界分别指的是欲界、色界、无色界、四梵天、三清天以及大罗天。
中国第一个遗传学专业是由谈家桢建立。谈家桢是中国现代遗传学的奠基者,同时也是国际遗传学专家,他从事遗传学的研究和教学已有七十余年。20世纪50年代,他于复旦大学创建了中国第一个遗传学专业。
历史朝代顺序表(顺口溜):三皇五帝始,尧舜禹相传;夏商与西周,东周分两段;春秋和战国,一统秦两汉;三分魏蜀吴,二晋前后沿;南北朝并立,隋唐五代传;宋元明清后,皇朝至此完。
药学职称考试是针对在医院药房工作的人员的资格考试。药学职称考试属于全国卫生专业技术资格(中初级)下的一个专业分类。