题干

等比数列an中,a1>0,则“a1<a4”是“a3<a5” 的(  )

A:充分而不必要条件

B:必要而不充分条件

C:充要条件

D:既不充分也不必要条件

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答案(点此获取答案解析)

A

同类题2

阅读理解

    If Frida Kahlo(1907-1954) is today one of the best-known and most popular figures of 20th-century, Mexican art, it is undoubtedly because of her personality and the originality(独创性)of a body of works. Her work is, above all, the expression of a real life-a tragic and stormy life, one that challenged all conventions. The mere mention of her name excites enthusiasm and admiration, but her work is rarely exhibited, and has not been shown in France for fifteen years. The selection to go on show at the Musee de L'Orangerie includes major works by the artist, with masterpieces from the Museo Dolores Olmedo.

    The life and work of Frida Kahlo cannot be separated from those of her companion Diego Rivera(1886-1957). Together they became figures of legend, and both have a place in the pantheon of 20th-century Mexican artists. Famous for his large wall paintings, Rivera's easel paintings, drawings and prints, which form a large part of his artistic production, are less well-known to the public in Europe. The exhibition aims to trace his artistic career from the early Cubist images, revealing his links with the Paris artists whose works are a key element in the Orangerie collections, to the paintings that established him as the founder of the 20th-century school of Mexican art. His travels throughout Europe influenced his vision and his skills without ever distancing him from his roots, thus confirming his place in history as the founder of the nationalist school.

    The exhibition devoted to the legendary couple Diego Rivera and Frida Kahlo presents their works together, as if to confirm the impossibility of their divorce that was in fact finalized(定下来)but reconsidered after just one year apart. It also gives us a better view of their respective artistic worlds, so different and yet so complementary(互补的), through the deep-rooted attachment they shared to their country.

同类题3

阅读下列材料,并按要求回答问题。

材料一 近年来,随着现代信息技术的发展,论坛的开放、博客的普及、微博的运用……互联网技术的不断革新使世界进入信息新时代。然而,一些人利用网络的便利,频繁地在网页上滚动播发代写代发论文的小广告,一点一点吞噬着互联网的纯净和公信;也有一些人利用网络通信技术,滥发垃圾电子邮件和短信;更有一些人在网络虚拟世界里肆意“扔垃圾”“泼脏水”,凭空捏造、传播虚假有害信息,让人们感到互联网不可信、不靠谱。种种不规范的网络行为,不仅损害了公民权益,扰乱了社会秩序,引发了公众恐慌,也破坏了网络的公信力。其实,现实世界也好,虚拟空间也罢,都有道德和法律的边界,每一个参与者都要担负起道德和法律的责任。

材料二  道德楷模郭明义从90年代起,每天都提前2个小时上班,15年相当于比别人多干了5年的工作;他还是生活中最常见的“好人”,在浴池给老人搓澡,每次下楼时都捎上邻居的垃圾,一辈子没占过便宜……。郭明义经常说:“给人温暖就是给自己幸福。每做一件好事,就有一股幸福感涌上心头,越做越有劲!”“奉献使人快乐、助人使人幸福”。“帮助别人改变命运,比啥都幸福”。“一个不爱家的人,就不会爱社会;一个不孝敬父母的人,就不会忠于国家。”