明朝初年，朱棣发动“靖难之役”夺取王位即为明成祖，欲请方孝孺为其草拟即位诏书，成祖曰：“先生毋自苦，予欲法周公辅成王耳。”孝孺曰：“成王安在？”成祖曰：“彼自焚死。”孝孺曰：“何不立成王之子？”成祖曰：“此朕家事”。相传方孝孺后被诛十族。明成祖的话揭示了中国古代哪一重要的制度（    ）

在种子萌发形成幼苗的最初阶段（指幼叶变绿前），幼苗干重有可能大于种子干重。

某中学的八年级生物兴趣小组利用假期对当地的谋片森林进行了调查，下面是他们调查报告中的一段话：森林里生活着高大的乔木．低矮的灌木和大量的草本植物，有许多鸟类在此栖息，有的鸟吃草籽，有的鸟是杂食性的（既吃草籽又吃昆虫）．昆虫主要吃植物的茎和叶．有些鼠类以植物的果实为食，然而鼠又是鹰的食物，鹰也捕食鸟．根据以上描述，兴趣小组绘制了如图的食物网，请分析回答相关问题．

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What is the best way to study? This is a very important question. Some Chinese students often1very hard for long hours. It is a2habit, but it is not a better way to study. An efficient(讲效率的) student must3enough sleep, enough food and enough rest. Every week you 4to go out for a walk or visit some friends or some nice places. It's good5your study. When you return to your studies, you'll find yourself6han before and you'll learn more.

Maybe we can7that learning English is8taking Chinese medicine. We don't mean that it's bitter (苦的). We mean that like Chinese medicine, the efficiency of your study9slowly but surely.10slowly but surely every day and effects will come just like Chinese medicine.