题目内容

【题目】人类认识地球形状的过程,是一个不断进行科学探索的过程,是认识逐步提升的过程。请结合人类认识地球的过程,完成下面小题。

1下列关于地球形状的说法,正确的是

A.地球是一个正球体B.天圆地方

C.天如斗笠,地如覆盘D.地球是一个不规则的球体

2人类首次证实地球是一个球体的事件是

A.麦哲伦环球航行B.人造卫星上天

C.郑和下西洋D.人类登上月球

3地球的平均半径是

A.6371千米B.6357千米C.6378千米D.6317千米

【答案】

1D

2A

3A

【解析】

人类对地球形状的认识,经历了漫长而艰难的探索过程。科学家经过长期的精密测量,发现地球是一个两极稍扁、赤道略鼓的不规则球体。经过测量,地球的极半径为6357千米,赤道半径为6378千米,地球的平均半径为6371千米,地球表面积为5.1亿平方千米,赤道周长约4万千米。

1科学家经过长期的精密测量,发现地球是一个两极稍扁、赤道略鼓的不规则球体。根据题意。
故选:D

215199月,航海家麦哲伦率领一支200多人的探险船队,分乘5艘帆船从西班牙出发,向西南穿越大西洋,绕过南美大陆南端的海峡,进入太平洋。向西穿过印度洋,绕过非洲南端的好望角,终于在15229月回到原出发地西班牙。麦哲伦船队首次完成了绕地球一周的航行,证明了地球是一个球体。
故选:A

3经过测量,地球的极半径为6357千米,赤道半径为6378千米,地球的平均半径为6371千米,地球表面积为5.1亿平方千米,最大周长约4万千米。
故选:A

考查地球大小、形状的认识,要理解记忆。

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【题目】 It’s Sunday morning and the weather is nice. Tyler rides his bike to the park. There are many people in the park. Some students and teachers in Tyler’s school are there, too. Everyone takes a bag. Tyler’s classmate Ella sees him and comes over. “We are cleaning the park,” she says. “Do you want to help?” “Sure,” answers Tyler. Ella gives() him a bag.

There is garbage(垃圾) everywhere. Tyler puts() bread bags, juice boxes, newspapers and a lot of other garbage into his garbage bag. After an hour, his garbage bag is full(满的). Many other people have full garbage bags, too.

When everyone finishes, the park looks great. They put up signs(指示牌) around the park to tell people to keep the park clean. The teachers buy every student a hamburger and some orange juice for lunch. After they eat and drink, Tyler and other students put their garbage into the garbage cans(垃圾桶).

1How does Tyler get to the park?

A.On foot.B.By bike.C.By bus.D.By car.

2What are Ella and many other people doing in the park?

A.Having a party.B.Watching a show.C.Cleaning the park.D.Flying kites.

3How long does it take Tyler to make his bag full?

A.30 minutes.B.40 minutes.C.60 minutes.D.20 minutes.

4Which of the following may be the words() on the signs around the park?

A.Don’t eat or drink.B.Don’t leave garbage.

C.Welcome here again.D.Don’t be late.

5What can we learn from the passage?

A.Ella is Tyler’s best friend.B.Tyler lives far from the park.

C.Tyler has a hamburger and some juice for lunch.D.Ella doesn’t have lunch.

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