问题 选择题

对下列物体的质量和重力估测正确的是(     )

A.一个苹果的质量大约是0.15kg

B.一个鸡蛋的质量大约是0.5kg

C.一盒火柴的重力大约是10N

D.一位中学生的体重大约是60N

答案

答案:A

题目分析:解决此题要结合生活常识估测物体的质量m,对我们生活中不常接触的重力单位N,多数人看到数据后很难跟生活经验对上号,所以我们可以利用公式G=mg计算重力。

A、一个苹果的质量大约是0.15kg,故A符合题意;

B、一个鸡蛋的质量大约是50g=0.05kg,故B不符合题意。

C、一盒火柴的质量大约是10g,重力大约是G=mg=0.01kg×10N/kg=0.1N.不符合题意。

D、一位中学生的质量大约是60kg,重力约G=mg=60kg×10N/kg=600N,故D不符合题意。

故选A。

点评:本题考查了质量和重力的估测,估测的题目,一定要与生活中的数值结合起来进行判断和比较,在估算重力时,代入数据,可以取g=10N/kg。

阅读理解

My name is James Brown. I have an 8-year-old daughter. Her name is Ann. Her favorite activity is watching movies. She watches movies once a week . Movie World is in my neighborhood . And it is the biggest movie theater in the city . It has the most comfortable seats and the best sound . She likes watching movies there.

Last Sunday, I took her to Movie World to watch the movie Epic(森林战士). Epic is a movie about a father Bomba and his 17-year-old daughter Mary. Bomba was interested in looking for Leaf Men. He said they lived in a forest, but no one believed(相信)him. One day , Mary was swept into (调入) the world of the Leaf Men, and she found her father was right.

At this early-afternoon showing, the theater was almost full. 60% of the audiences were kids aged three to ten and their fathers. I didn’t think it was because of the movie itself. In fact, a study showed that dads were 50% more likely than moms to take young kids to the movies in the United States.

根据文章内容,选择最佳答案。

小题1:Who went to see the movie Epic ?

A.Mary and her dad.

B.Mary and her sister.

C.Ann and her dad.

D.Ann and her mom.小题2:Movie World has          .

①the best sound                ②the shortest waiting time

③the biggest screens            ④the most comfortable seats

A.①②

B.③④

C.②③

D.①④小题3:Mary is         years older than Ann.

A.8

B.9

C.11

D.17小题4:What does the underlined word “audience” mean in Chinese?

A.观众

B.学者

C.导演

D.士兵小题5:What can we learn form the passage?

A.Ann watches movies every day.

B.Movie World is far from James’ home.

C.In the movie Epic , Mary was interested in looking for Leaf Men.

D.In the United States, dads take their kids to watch movies more often than moms do.

多项选择题