我国面积最大的盆地是：

一个中学生的体重大约为（　　）

广西龙江河镉超标，严重威胁着民众的饮水安全．为处理镉污染，当地政府组织人员在镉超标水域投放了大量烧碱或熟石灰，以及氯化铝，絮凝沉降镉离子，避免被人体吸收．则下列说法错误的是（　　）

    One morning Mr. Green is driving 1the country and2a small bookshop. When he sees an old man3the side of the road, he stops his car and says to the old man, "I want 4to the Sun Bookshop. Do you know it?" "Yes, "the old man answers, "I 5 you the way. "He6Mr. Green's car, and they drive about twelve miles.7they come to a small house, the old man says, "Stop here. "Mr. Green stops and 8the house. "But this isn't a bookshop, "he says to the old man. "Right, "the old man answers, "This is my house. And I'll show you the way 9the bookshop. Turn around and go back nine miles10you'll see the bookshop. "