题干

1912年,德国科学家魏格纳提出了大陆漂移说,否定了前人的大陆均衡说、陆桥说,却被大多数学者斥为“荒诞的怪论”。20世纪50年代,支持大陆漂移说的新证据越来越多,大陆漂移说重新活跃起来。在此基础上,科学家通过进一步探讨,创立了后来成为主流的海底扩张说和板块构造说。人们对大陆漂移说认识的转变佐证了(      )
①认识具有反复性,人们追求真理的过程总是曲折的
②认识具有无限性,人们追求真理是永无止境的过程
③认识具有创新性,认识的进步以推翻已有理论为前提
④认识具有相对性,任何真理性认识都包含着谬误的成分

A:①②

B:①③

C:①④

D:②③

上一题 下一题 0.0难度 选择题 更新时间:2018-01-09 08:04:00

答案(点此获取答案解析)

A

同类题5

完形填空

    Last winter vacation, my brother got a set of bedroom furniture for his thirteenth birthday. When it arrived, I helped my parents moved the 1 furniture to the garage(车库). It was still in good condition. I thought it might be a chance for us to 2 someone in our community. I started to search neighbors, anyone who 3 a bedroom set. Finally, my mom helped me call the local primary school. They told me about Jaila, the daughter of a poor single mother. I was given a telephone number and 4, and I soon found myself at Jaila's.

    The moment I went into Jaila's room, I knew I had taken on too big a task. When I pushed the old door open, it made a long high noise. But the door was nothing compared with the rest of the room. Some old paint was 5 the wall. One of the windows was 6 The bed was just a mattress(床垫)on the old carpet. It seemed that the room needed7furniture — it cried — for a complete makeover(翻新).

    That day I spent at least an hour looking around and 8how I could possibly fixed the room. I had never painted a wall, let alone fixed a floor. The second day, I returned with a large group of helpers — my close friends. We went to collect everything needed door to door in our community. We replaced and repainted Jaila's room. We sweated in Jaila's house for more than ten hours every day that week.

    The moment we finished, we called Jaila into the room. She jumped, laughed and hugged each of us. I turned to Jaila's mother, and saw she had tears running down her face.

    “Anna,” Jaila called my name9.

    “Yes?”

    “Welcome to my new room!”

    When we saw how happy Jaila and her mother were, our tiredness disappeared into thin air. We are really 10 to make a special experience of changing someone's life.