实现有保证的增长率，要求满足的条件是（）。
A.S＝sY
B.S＝I
C.I＝Vy
D.S＝V
参考答案：B
解析：保证的增长率要求S＝I。
In the International Young Pianists Competition, when it was________that Lang Lang had won, he was
too excited to hold back his tears.[ ]
A. told
B. mentioned
C. announced
D. recognized
安全带的正确挂扣方法是（）。
A.低挂高用
B.高挂低用
C.平挂平用
