题目

—_____ is your teacher’s desk? —About 140 centimeters. A. How far                 B. How many         C. How much        D. How long 答案： D  下列加速固体物质溶解的措施中，能改变固体物质的溶解度的有（ ）A．加热B．把固体研细C．搅拌D．振荡