题目

关于细胞中的化合物，下列说法错误的是（） A . 颤藻和小球藻细胞中都有DNA和RNA，且都以DNA作为遗传物质 B . 若细胞中的某蛋白质含有X条肽链，则其至少含有X个羧基 C . 淀粉、淀粉酶都以碳链作为基本支架 D . 组成人体细胞的元素和化合物在无机自然界中都可以找到 答案：D改错。     Swimming is very popular in summer. People like swimming in summer because of                                       1.__________water makes people feeling cool. If you                                              2.__________like swimming and swim in a wrong place, it may not be safely. These years, more than                                       3.__________nine hundreds children died while they were                                        4.__________having a good time in the water most of                                              5.__________them were students.