阅读理解。

 Dear Mum,

    Thanks for the new dress. It's so nice! It's hot in Wuhan. I wear the dress to school. I am very happy. Miss Li says I can go back home after Friday. I want to buy a pair of sunglasses.They'reninety-one yuan. Thet're too expensive.

                                                                                                                                                                                              Love,Mary

魏晋南北朝时期，在世界农学史上占有重要地位的农业科学著作是（    ）

有位学者撰文指出，李白那追求理想、反抗权贵、要求自由的精神，个性张扬的气质，高亢豪迈的性格，雄奇飘逸的诗风，特别是他那吞吐天地、囊括寰宇的气势，无疑是唐朝政治、经济全面繁荣昌盛在精神领域的真实反映和写照。这表明（  ）

①文化是经济和政治的反映

②一定的文化由一定的经济、政治所决定

③李白的诗歌在盛唐是最优秀的

④先进的、健康的文化会促进社会的发展