种子在萌发过程中，种子的各部分结构发生什么变化？用连线的方式表示出来．
双子叶植物种子主要有种皮和胚构成．单子叶植物种子由种皮、胚和胚乳组成，而胚是种子的主要结构，它包括子叶、胚芽、胚轴、胚根四部分，胚是发育新植株的结构．在种子的萌发过程中，种皮脱落，胚芽发育成茎和叶、胚轴发育成连接茎和根的部分、胚根发育成根、子叶转运营养物质或储存营养物质作用，所以是新植物体的幼体．
故答案为：
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It was the early autumn of my 1._____ year at a junior high school, and my old school was far away. As a result, no one knew who I was.I was very 2_____,and afraid to make friends with anyone. Every time I heard the other students talking and laughing, I felt my heart 3._____.I couldn't talk to anyone about my problem, and I didn't want my parents to worry 4._____ me. Then one day, my classmates talked happily with their friends, 5._____ I sat at my desk unhappily as usual. At that moment, a boy entered the classroom. I didn't know who he was. He passed me and then turned 6._____ He looked at me and, without a word, smiled. Suddenly, I felt the touch of something bright and friendly. It made me feel happy, lively and warm. That smile 7._____ my life. I started to talk with the other students and made friends. Day by day, I became more active and closer to everyone in my class. The boy with the lucky 8._____ has become my best friend now. One day,I asked him why he smiled, but he couldn't 9._____ smiling at me! It doesn't matter cven if he didn't tell me the 10._____ ,because all the dark days have gone. Now I believe that the world is what you think it is. If you think you are lonely, you might always be alone. So smile at the world and it will smile back. |