赫尔希和蔡斯分别用³⁵S和³²P标记T2噬菌体的蛋白质和DNA，下列被标记的部位组合是（    ）

同样是写梅，陆游的梅是寒士之梅，毛主席的梅是战士之梅。做寒士时，有“零落成泥碾作尘，只有香如故”的品质；做战士时，有“已是悬崖百丈冰，犹有花枝俏”的傲骨，两者都是人生非常重要的品格，共同构成了中国传统文化中梅的意象。从中我们可以体会到（    ）

①把“梅”作为精神追求的目标，与中华民族精神的核心相得益彰

②“梅”文化以其特有的包容性，彰显中华文化博大精深

③梅花被赋予特定时代的相应内涵，成为中华民族气节之象征

④文学艺术中梅所幻化出的人生品格彰显了中华文化的博大精深

用下列方法制取氢气，反应速率最大的是（   ）

根据短文内容，选择正确答案。
C
    Mr. Brown lives in a nice house in a small town with his wife，Mrs. Brown. From Monday to Friday he works in an office near his house. He is free on Saturdays and Sundays. He has a nice garden beside his house. He likes growing flowers and he often works in the garden on Saturdays and Sundays. The flowers are very beautiful and Mrs. Brown likes them very much. She often helps Mr. Brown.

下列说法正确的是