问题
选择题
种子是由哪几部分组成（ ）
A．种皮、果皮、胚
B．种皮、果皮、胚乳
C．果皮、胚、胚乳
D．种皮、胚、胚乳
答案
种子的结构主要是由种皮、胚和胚乳，胚由胚芽、胚轴、胚根、子叶四部分组成，胚芽将来发育成新植物的茎和叶，胚根发育成新植物体的根，胚轴发育成连接根和茎的部位，因此胚是新植物的幼体，是种子的主要结构．
故选D
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种子是由哪几部分组成（ ）
A．种皮、果皮、胚
B．种皮、果皮、胚乳
C．果皮、胚、胚乳
D．种皮、胚、胚乳
种子的结构主要是由种皮、胚和胚乳，胚由胚芽、胚轴、胚根、子叶四部分组成，胚芽将来发育成新植物的茎和叶，胚根发育成新植物体的根，胚轴发育成连接根和茎的部位，因此胚是新植物的幼体，是种子的主要结构．
故选D
| 阅读理解 | |
How to have fun in Chicago without spending a lot of money?
| |
| 1. This passage is written to tell us ______. | |
| A. Chicago is a big and beautiful city B. where we can see fine photos and paintings C. how to make a cheap trip in Chicago D. there are many free concerts in Chicago | |
2. It will cost you ______ if you visit the Art Institute instead of the Sears Tower on Sundays. | |
| A. more B. less C. the same D. none | |
| 3. You may go to ______ if you like to get a great view of the whole city. | |
| A. the Art Institute B. the Sears Tower C. Roosevelt University D. Grant Park | |
| 4.You have to spend at least _______ in all to stay in a dormitory room at Roosevelt University for a month. | |
| A. $100 B. $300 C. $215 D. $860 | |
5. According to this passage, w hi ch of the following is NOT true | |
| A. You are free to go to the Art Institute on Tuesdays. B. Free Grant Park concerts are held four nights a week in summer. C. The Sears Tower is the world's third tallest building. D. You can get tickets to The Oprah Winfrey Show as soon as you arrive. |