题目

通读下面短文，掌握其大意，然后按照句子结构的语法和上下文连贯的要求，从每题所给的四个选项中选出一个最佳答案。Mikeis an Australian boy. Now he studies in Guangzhou. He is1Grade Seven. He has a dog. It's black2 white. The dog's very clever.Mike likes it very much. 3favorite food is the bone. Every day whenMike 4 home,the dog meets him in front of the house.Mike'sfriend, Amy is 5 Englishgirl. She is in Guangzhou, too. They are in the same grade, 6 in different classes. She hasa pet panda. It's 7 ablack and white one, but it 8 a real panda. It's市场上流行的直饮机的核心部件是逆渗透膜，它利用逆渗透原理，通过水压使水由较高浓度的一侧渗透至较低浓度一侧，理论上在较高浓度一侧的所有细菌及杂物、可溶性固体物和对人体有害的有机物和无机物均不能通过高精密的逆渗透膜，如图所示。根据上述信息判断，下列有关叙述正确的是（ ）A．逆渗透过程与渗透作用的差异是前者需要消耗能量B．逆渗透膜也具有细胞膜的识别功能C．逆渗透膜上有载体蛋白，可以选择性控制有害物质D．逆渗透膜去除有害物质的能力胜过生物膜，可放心饮用直饮机中的水