系统软件中最重要的软件是（)。A．数据库管理系统B．工具软件C．语言处理程序D．操作系统
听力原文：Compared to a meat-centered diet, meatless meals can easily supply all the essential nutrients our body requires, and cost only 20% to 30% as much.
【S2】
That community must now lead extensive reform. of the region's universities and scientific institutions, rather than ______ against it.
某工程项目建设工期为三年，为保证施工顺利进行，开工前的到位资金原则上不得少于工程合同价的（)。A
