油菜是一年生植物，叶是卵形的，具有网状叶脉和直根系，冬小麦则是二年生植物，它的叶是线形的，具有平行叶脉和须根系，请你说说，这里分别用了哪几个特征描述这两种植物？
题中的油菜是一年生植物和冬小麦是二年生植物是说明这两种植物的生长周期，油菜是网状脉和冬小麦是平行脉描述的是二者的叶脉情况，油菜的叶是卵形的和冬小麦的叶是线性的说的是植物的叶形，油菜是直根系和冬小麦是须根系描述的是植物的根系特征．因此这里分别用了生长周期、叶形、叶脉和根系这四个特征来描述这两种植物．
故答案为：这里分别用了生长周期、叶形、叶脉和根系这四个特征来描述这两种植物．
While reading a book in English, every few lines, you run across a word or two that you don't know. You look up every new word in the dictionary. Bad move. All that does is slow you down. Even electric or CD-ROM dictionaries can get in the way of your reading progress. A dictionary is like a road map. It can help you if you get lost and point you in the right direction. But if you stop to look at the "map" each time you take a step, you'll get nowhere fast. On your English learning "journey", a dictionary can be a helpful "travel companion"—if it's not overused. To help you start thinking in English, use an English-to-English dictionary. Otherwise, you'll always depend on your native language and end up translating in your head. A good dictionary can help you do more than just find the meaning of a word. It can help you verify (test and check) spelling, check word forms and grammar usage, find example sentences and learn pronunciation. Some dictionaries even provide exercises to teach you how to use their resources. Take time to get to know your dictionary. Learn the pronunciation symbols. Understand what the abbreviations(缩写  字) mean. Become familiar with the grammar codes that explain the usage for each word. Look for charts, diagrams and lists that might be useful in the future. You'll discover how rewarding it can be to make friends with your dictionary. And as they say, "A friend in need is a friend indeed".小题1: The underlined word "that" used in the last paragraph refers to ________.
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