牵引索与蒸汽活塞连接的两个滑轮为____ （选填“定滑轮”或“动滑轮”）。

根据生态学原理要使能量流经食物链的总消耗量最少，人类应采取哪种食物结构？（　　）

Dear Annie，

    Thank you for your letter.Here is something about my school.

    I go to school 1 Monday to Friday.We have four 2in the morning and two in the afternoon.3 we have many things 4 after class? Of course! 5Monday and Thursday afternoon we do sports. On Tuesday afternoon, all of us have a 6 class.I like drawing 7 I can't draw well. And on Thursday afternoon, we have a singing class.On Friday afternoon we practice speaking 8My Chinese friends would like to speak with me in English.They think I am like an English 9Isn't it great？

    On Saturdays and Sundays I don't go to school.Very often my family and I go to the 10 and have a good time there.

Yours,

Lucy

某图书馆服务中心为读者提供书籍数字化服务，可以帮读者把纸质图书扫描并制成电子书。请你以服务中心工作人员的身份，根据以下图示，向前来咨询的读者说明整个服务流程。要求：内容完整，语言得体、简明、连贯，不超过85字。

下列各句中划线词的意义相同的一项是(     )