一物体做匀变速直线运动，某时刻速度的大小为3m/s，在1s后其速度_爱下问搜题

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问题多项选择题

一物体做匀变速直线运动，某时刻速度的大小为3m/s，在1s后其速度大小变为9m/s，在这1s内该物体的（）

A.位移的大小可能等于6m

B.位移的大小一定等于3m

C.加速度的大小可能等于6m/s²

D.加速度的大小可能等于3m/s²

答案

参考答案：A, C

解析：

当初速度与末速度同向时，平均速度为，1s内位移为，所以A正确；B错误；加速度，所以C正确；若初、末速度反向，则加速度，所以D错误。

完形填空

A Faithful Father
My husband ,kissed me goodbye ，stroked, the baby’s cheek and then rushed out of the door ，into his busy day. With the cold of the morning fading, I fed my baby and it fell fast asleep. Usually I would place it in bed and quickly have the house somewhat in 36______ ,
This morning ，however, I stayed seated ,just 37_____,with the baby in my arms ,The thoughts ran into 38______ of the mornings with my husband, a father rushing out of the door to meet the obligations of life. It was only a small jump to thoughts of my own 39______
My mother passed away when I was ten, and as I looked 40 ______I could see how much of a family man my dad was. He went to work every morning and 41______ to his family every evening. He 42______ food, clothing, warmth ，and protection. He was a faithful father.
Setting the baby down ,I dialed the 43 ______ number. I had just realized the 44 ______ of the ordinary—the daily life going on around us that we often took for granted, and that it needed to be 45______
“Hi ，Dad. ” I said, 46______ back tears.
“Hey, Bud- How are you? ” 47______ was in his voice.:
“ Fine, Fm just calling to say. ,, thank you. ” I got it out before my throat 48______ too much for me to speak.
"What for?”
— For getting up and going to work every morning of ray life. Now that I have my' own 49______ and I see my husband doing the same ，I just wanted to thank you for being 50______ ”
There was 51______ for a moment as my dad composed himself ，and with a small . .52______ in his voice he said, “You’re welcome, Bud. ”
I don’t remember much of the rest of the call, 53______ that moment of revelation (显露） about my father, I will never forget. There are those who are known for their heroic 54 ______，and also those who are known for their fortunes and fame ，but it is the 55 ______everyday fathers who are the true heroes. I’m thankful that my father was one of them.

A．conversations

B．significance

C．considerate

A．outstanding

多项选择题

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A.豆制品、肉类

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