题目

For many of us, the goal is to get into a top university, is widely considered the first step toward a successful future. A. what      B. which         C. where         D. that 答案：B9．请在下面的数字后面填上适当的单位：（1）一本初二物理书的质量约是220g；（2）铁的密度是7.9g/cm3；（3）小明背的书包约重60N．