问题
单项选择题
下列物体或人,可以看作质点的是()
①研究跳水冠军郭晶晶在跳水比赛中的空中姿态
②研究奥运冠军王军霞万米长跑的轨迹
③研究一列火车通过某路口所用的时间
④研究我国科学考察船去南极的路线
A.①③
B.②③
C.①④
D.②④
答案
参考答案:D
下列物体或人,可以看作质点的是()
①研究跳水冠军郭晶晶在跳水比赛中的空中姿态
②研究奥运冠军王军霞万米长跑的轨迹
③研究一列火车通过某路口所用的时间
④研究我国科学考察船去南极的路线
A.①③
B.②③
C.①④
D.②④
参考答案:D
完形填空。 | ||||
Yu Mei __1__ some pizzas. So she goes to a house of pizza __2__ her mother. There are many kinds of __3__ and many people in it. Yu Mei is very __4__. She sees a nice pizza, but it's too small. She'd like a __5__ one. There are two pizzas on the shelf( 货架). She likes a big one __6__ onions and olives. She wants her mother to buy it __7__ her. When she __8__ some drinks, she also asks her mother to buy some. Her mother buys a big pizza, orange juice __9__ green tea. __10_ are they? Only $4.5. | ||||
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