今年以来，大学生违法犯罪问题引起了社会的广泛关注。投毒害死室友、举刀捅死亲人、贩毒、纵火，考试抄袭、论文剽窃等等，一件件触目惊心、发人深省。一些教育界人士认为，导致以上现象发生的原因在于学校和家庭教育的缺失，在于西方文化的泛滥。只有加强对中小学生进行传统文化尤其是传统道德教育，才能有效预防大学生违法犯罪的发生。

请你运用文化生活有关知识对以上观点进行辨析。

实验室里常常用验电器来检验物体是否带电，用被丝绸摩擦过的玻璃棒靠近验电器的金属球时，可发现验电器的两金属箔会因排斥而张开，对这一现象下列说法正确的是（　　）

非洲的人口自然增长率在世界各大洲中居____ 位．____ 增长过快，____ 供应不足，生产水平落后，开垦草地和森林，致使____ 恶化，成为本区各国普遍遇到的问题．简单总结为：____ 、____ 、____  问题．解决途径：____ ．

A．氮气     B．二氧化碳     C．氧气     D．水蒸气  E．氖气

    For some time, I had been thinking that I wanted to do something to make strangers smile. I decided that I ____ (leave) small notes around shops and other public places with positive sayings or kind words for strangers ____ (find).

    A friend on Facebook posted that she had received a lot of beautiful paper from an artist friend and was wondering what to do with it. I told her about my idea, and she ____ (immediate) said that this must be what her paper was meant for.

    So two friends on opposite ____ (side) of the world started leaving these random notes of kindness. I leave my notes without ____ (expect) any particular result. It doesn't matter whether they are read ____ thrown away. The main thing is that I did this act.

    I now carry around a notebook in ____ I write down lovely and inspiring phrases that I find. And I buy packs of Post­ its to write notes on whenever I see ____ opportunity to make a stranger smile. I only leave the notes when I am feeling in a ____ (happily) mood, as I don't want to pass any negative energy on to someone else.

    I sign them all ____ (say) that this note is left for you by a stranger to make you smile. Then, I add a heart.