20世纪最后一期《时代周刊》评选出一位“世纪人物”，称他为“天才、原子和宇宙谜的开启者”。这位“世纪人物”最重要的贡献是（    ）

把下列数填入适当的圈里。(按题中数的顺序填写）

38 24 45 6 14 20 33 60 95 78 54 126

2的倍数____       3的倍数____    5的倍数____

既是2的倍数、又是3的倍数的数有：____

既是2的倍数、又是5的倍数的数有：____

    Are you interested in country music? I like it very much! It will take me away for a while after I am tired. The guitars and songs will take me to mountains and fields.

    Country music usually talks of everyday life and feelings. It's the spirit of America, easy to understand, slow and simple.

    Country music developed in the Southern United States. It was the folk music of American countryside. Many of songs tell about the lives of farmers. They talk about love, crops or death.

    The life of the countryside can be hard, so the words in country music are often sad. At first, people played the music only at family parties. But it became more popular later. In the 1920s, people played country songs on the radio, and they made them into records.

    When people in the countryside moved to towns and cities to look for work, they took their music with them. Country music continued to change and became popular across America.

    John Denver was one of America's most famous country singers in the 1970s.His song Take Me Home, Country Roads is well­known and people still play it today.

【风雨飘摇陷深渊】
材料一 1929年10月下旬，一场资本主义经济危机的风暴首先猛烈袭击美国，不久扩大到加拿大、德国、日本、英国、法国等国，并波及许多殖民地、半殖民地和不发达国家，……与危机前的最高点和危机中的最低点相比，英国出口额下降了50％，美国下降了70％，德国下降了69.1％。
——吴于廑、齐世荣主编：《世界史·现代史编》上，高等教育出版社

【狼烟肆虐心犹寒】
材料二 20世纪两场战争简表（如下）

【且行且思归正道】
材料三 如下图

注：图一为联合国的标志，中间是从北极上方看到的地球，外围是象征和平的橄榄枝图案。图二为世界贸易组织标志，该标志由6道向上弯曲的弧线构成，意味着世贸组织在持久和有序地扩大世界贸易方面将发挥关键作用。6道弧线组成地球的形状，表示世贸组织是由不同成员国构成的国际组织。