题干

2009年7月22日,太阳照常升起。但这一天的太阳又是如此特殊,这是本世纪持续时间最长的日全食,对于中国人来说,更是500年一遇的奇观。过去,民间流行“天狗吃日”的说法,现在普通群众都知道日食是太阳、地球、月球三者运行造成的现象。这体现了   

A:每个人的认识都是无限发展的

B:人类认识是无限发展的

C:人类的认识具有反复性

D:社会实践是无限发展的

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答案(点此获取答案解析)

B

同类题4

阅读下列内容,从每小题所给的A、B、C、D四个选项中选出一个最佳答案。

    When I was young, I wanted a dog. But my parents always said I was too young. They suggested getting another kind of pet. But I wanted a dog, so I waited. When my parents thought I was old enough at last, I got Luke. From then on, I learned that having a dog was really hard work.

                                                                                                                                 -Kate

Cinder and I became good friends about a year ago. Cinder is my dog. I named her Cinder because my name is Cindy. I think the name Cinder sounds nice. I got the dog on my twelfth birthday. The next morning, I went to the library to find out some information about how to take care of the dog.

-Cindy

I'm in Grade Four at the Blake School. My pet hamster(仓鼠), Lightning, lives in our classroom. She is brow n and white. I got my hamster two years ago. My friend Jason and I gave each other a hamster for our birthdays. I brought my hamster to school once and the other kids liked her. I decided to leave her there, because my parents hated having Lightning in the house.

                                                                                                                               -David

同类题5

下表为甲、乙、丙三个稳定草原生态系统中植物调查的统计数据。据表可以判断
草原类型
甲
乙
丙
植物总种数
160
100
80
平均种数(种数/ m2)
20
18
10
平均产量(千克干重/ hm2)
2000
900
200
旱生植物的种数比例(%)
25.0
49.0
78.0