题目

______ fathers both work at school. A．Sonia and Alice's                         B．Sonia's and Alice C．Sonia's and Alice's                       D．Sonia and Alice 答案：C下列物质中，在核糖体内合成的物质有（　　）①性激素     ②K+的载体    ③淀粉    ④消化酶    ⑤纤维素． A、①②B、②③C、②④D、②⑤