题目内容

【题目】读世界部分国家耕地总面积、人口和国土面积表。

美国

俄罗斯

印度

中国

耕地总面积(万公顷)

17043

12157

15865

12173

人口(亿)

3.21

1.43

12

13.41

国土面积(万平方千米)

960

1700

298

960


(1)表中耕地总面积占国土面积比重最大的国家是(  )
A.美国
B.俄罗斯
C.印度
D.中国
(2)表中国家人口密度最大的国家是(  )
A.美国
B.俄罗斯
C.印度
D.中国
(3)表中国家人均耕地面积最小的国家是(  )
A.美国
B.俄罗斯
C.印度
D.中国
(4)下列对我国耕地基本特点的叙述,正确的是(  )
A.耕地总体质量较高
B.人均耕地面积很小
C.耕地总量居亚洲第一
D.人均耕地面积较大

【答案】
(1)C
(2)C
(3)D
(4)B
【解析】(1)耕地面积/总面积=人口算术密度/人口生理密度。利用表格中的数据可算出各国耕地在国土中所占比重:美国是17.7,俄罗斯是7.1,印度是53.2,中国是12.6;印度耕地面积在国土中所占比重最大。故选:C(2)根据人口密度= 可知,俄罗斯的人口密度大约8.4人/平方千米;美国的人口密度大约为33.8人/平方千米;印度的人口密度大约为402.7人/平方千米;中国的人口密度大约为139.7人/平方千米;得出人口密度最大的是印度。故选:C(3)根据人均耕地面积= 可知,美国的人均耕地面积约为5309;俄罗斯的人均耕地面积约为8501;印度人均耕地面积约为1322;中国人均耕地面积约为907.故表中国家人均耕地面积最小的国家是中国。故选:D(4)我国山区面积广大,耕地主要分布在东部季风区的平原和盆地地区,总体质量不高;从表中数据得知,我国耕地总量比亚洲的印度少,但人口众多,因而人均耕地面积很小。故选:B

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【题目】

Rob Howes wanted to spend a day on the beach. He ____ his daughter Nicky and her two friends, Helen Slade and Karina Cooper. They all went to Ocean Beach in New Zealand, where Howes was a lifeguard.

The group swam and bodysurfed. Then they saw something____. Suddenly, “There are these fins,” said Howes.

The ____ saw seven dolphins moving towards them. The dolphins seemed worried. They ____the water with their tails. They kept moving in a circle around the swimmers. Then one large dolphin swam towards Howes and Helen. Next, it dived(潜水) down underwater. That’s when Howes saw something grey moving in the____.

A great white shark ____ underwater. It wasn’t far from the people. The shark headed straight towards Nicky and Karina. Now the shark was not slow. It moved ____! So the dolphins used their tails to swim even faster. Each one splashed its tail even more. Then Howes knew ____ the dolphins did so. The dolphins didn’t want to ____ him and the girls. These sea mammals(哺乳动物)wanted to keep them safe.

The dolphins stayed close to the group ____the shark left. When Howes and the kids were safe, the dolphins swam away.

“You want to say thank you and shake their flippers,” Howes said. This isn’t a fishy tale! These dolphins are heroes.

1A. brought B. missed C. returned D. searched

2A. broken B. common C. strange D. polluted

3A. trainers B. coaches C. fishermen D. swimmers

4A. held B. hit C. cleaned D. provided

5A. pool B. air C. island D. water

6A. waited B. washed C. grew D. served

7A. beautifully B. fast C. heavily D. away

8A. where B. what C. why D. whether

9A. play B. trust C. harm D. protect

10A. until B. because C. if D. since

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