题目

阅读下面材料，在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 The Internet is an amazing information resource. Students, teachers, and researchers use it as investigative tool. Journalists use it to find information for stories. Doctors use it to learn more about unfamiliar diseases and the (late) medical development. Ordinary people use it for shopping, banking, bill-paying, and communicating with family and friends. People all over the world use it to connect with individuals from countries and cultures. However, there are many positive developments“海宝”是2010年上海世博会的吉祥物，如图所示．点缀在上海街头的各种“海宝”中，有一座是材质均匀、实心的，其质量为3.0×103kg，密度为1.5×103kg/m3，与水平地面的接触面积为1m2，g取10N/kg，则（ ）A．这座“海宝”的重量为3.0×103NB．这座“海宝”对地面的压力为3.0×103NC．这座“海宝”对地面的压强为3.0×104N/m2D．这座“海宝”的体积为20m3