一个圆柱的体积是45m3，底面积是9m2，这个圆柱的高是多少米？
45÷9=5（米）；
答：这个圆柱的高是5米．
一个模块直接调用的其他模块个数称为______。
Alice received an invitation from her boss,____came as a surprise.[ ]
A.it
B. that
C. which
D. he
