题目

如图，线段AB=BC=CD=DE=1cm，图中所有线段的长度之和为（ ） A．25cm                 B．20cm                   C．15cm                 D．10cm 答案：B【解答】解：因为长为1厘米的线段共4条，长为2厘米的线段共3条，长为3厘米的线段共2条，长为4厘米的线段仅1条． 所以图中所有线段长度之和为：1×4+2×3+3×2+4×1=20（厘米）．根据句意和首字母提示每空填一个单词，使句意完整。 1. Jack plays sports every day, so he is very h_______. 2. Jane t_______ her mother is at home now. 3. My father is very s_______ with me. 4. What do you o_______ do? 5. We are b_______ with work, so I have no time to play. 6. Jennifer's e-mail a_______ is 7. Can you sing or d_______? 8. Thank you. You're w_______. 9. I'm very s_______ I'm late. 10. We will play football. J_______ us soon, please.