阅读《人之歌》，回答问题。

人之歌

纪伯伦

    ①从古到今，我一直存在，并将永远存在下去，直至千秋万代。

    ②我曾遨游在无边无际的苍穹；我曾翱翔在虚幻的世界中；我接近过至高无上的光明的神界；如今我却被囚禁于物质的樊笼。

    ③我受过孔子的教诲；听过梵天的哲理；也曾坐在菩提树下，伴随过佛祖释迦牟尼；可我现在仍是懵懵懂懂，信不信神明，我还在斗争。

    ④我曾在西奈山上看到过耶和华面谕摩西；曾在约旦河边见过基督显示的奇迹；还曾在麦地那听到过阿拉伯先知的教义；可我现在却仍感到迷茫、犹疑。

    ⑤我见到过巴比伦的强盛、埃及的光荣、希腊的威风，但从那些显赫的业绩里，我仍看到了虚弱、渺小和卑微。

    ⑥我曾与阿因·杜尔的巫师、亚述的祭司和巴勒斯坦的先知们坐在一起，但我至今仍在寻求真理。

    ⑦我记得降在印度的哲理、格言；能背诵出阿拉伯半岛居民心中的诗篇；也懂得那些体现西方人情感的音乐；但我仍是又瞎又聋，既看不清，也听不见。

    ⑧我曾受过狼子野心的侵略者的蹂躏；也曾遭到豪强、暴君的奴役、欺凌；然而我仍有力量来同岁月进行斗争。

    ⑨这一切是我童年时代的所见所闻；我会见到和听到青年时代的事业和功勋；还将随着年迈而臻于完美，最后将皈依于上帝。

    ​⑩从亘古到现在，我一直存在，并将永远存在下去，直到千秋万代。

（选自伍倍子编《中外哲理散文选》）

用显微镜观察人口腔上皮细胞时，将光线调得越亮越好．（判断对错）

    My best friend and I are in the same school. Her name is Alice. We first met each other two years ago. We were all new in the school then. She is beautiful. She has long black hair, round black eyes and a small nose. She doesn't like to dress up, so I usually see her wearing jeans and a T-shirt or sweater.

    Alice and I are always talking or laughing about something. She has a wonderful sense of humor (幽默感). When I am not happy, I like talking to her. And she always tries her best to make me happy.

    We have the same interests. We both enjoy playing the guitar and singing. We like going to the movies. Sometimes in summer, I go with her and her family to their summer house by the lake. We usually spend most of the afternoon swimming. In the evenings we walk into town or stay at home and watch TV. It's always fun to be with her.

    Though our lives get busy, we still have time to see each other. I am better in math and science and she is better in English, so we often help each other with our homework.

    I am lucky to have a friend like her.

“安史之乱”爆发于哪个皇帝在位期间（        ）