题目

Directions: Read the following text and choose the most suitable question from A-F for each answer. There is one extra question which you do not need. A. Don’t expect your notes to be perfect B. Make your notes neat and clean C. Set aside time to process your notes D. Separate out your notes E. Standardize your shorthand F. Keep your notes with your books 答案：76-80  FDEAC 解析: 略=将带叶的杨树枝条下端插入红墨水中，待一会儿把枝条纵切，茎内被染红的部分是（ ）A．筛管 B．导管 C．形成层 D．茎的全部