以下关于重力的说法中错误的是（） A.重力的施力物体是地球 B._爱下问搜题

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问题单项选择题

以下关于重力的说法中错误的是（）

A.重力的施力物体是地球

B.重力的方向总是竖直向下的

C.在同一位置，质量大的物体受到的重力大

D.重力的作用点叫重心，物体的重心都在物体上

答案

参考答案：D

解析：重力的施力物体是地球，A对；重力的方向总是竖直向下的，B对；根据G=mg，在同一位置，质量大的物体受到的重力大，C对。空心的篮球，重心不在篮球上，或者轮胎的重心不在轮胎上，D错

完形填空

When I was about twelve years old, my mother told us that we would not be ___1___ Christmas gifts for lack of money．I felt sad and thought, “What would I say when the other kids asked what I’d ___2___?” Then，three women ___3___ at our house with gifts for all of us．For me they bought a doll．I would no longer have to be ___4___ when I returned to school．
Years later, when I stood in the kitchen of my new house, thinking how I wanted to make my ___5___ Christmas special and memorable there, I ___6___ remembered the women’s visit．I decided that I wanted to create the same feeling of ___7___ for as many children as I could possibly ____8__．
So I ___9__ a plan and gathered forty people from my company to help．We gathered about 125 orphans （孤儿） at the Christmas party．For every child, we wrapped colorful packages filled with toys, clothes, and school supplies, each with a child’s name．We wanted all of them to know they were ___10__．Before I called out their names and handed them their gifts, I ___11__ them that they couldn’t open their presents until every child had come forward．Finally the __12___ they had been waiting for came as I called out, “One, two, three．Open your presents!” As the children opened their packages, their faces beamed and their bright smiles ___13__ up the room．The __14___ in the room was obvious, and it wasn’t just about toys．It was a feeling---the feeling I knew from that Christmas so long ago when the women came to visit．I wasn’t forgotten．Somebody still remembered me．I know I___15___．

B．settled down

B．embarrassed

D．occasionally

A．kept up with

B．caught up with

C．came up with

D．put up with

问答题简答题

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