社会保障基金的金融投资工具有（）
A、储蓄存款
B、债券
C、股票
D、外汇
参考答案：A, B, C
四、单句改错,每题1分共5分：
1. He made a trick on her by taking all the money.
2. Now plastic can take place of steel in may ways in life.
3. She apologized the teacher for losing her book.
4. He didn’t turn down for some reason.
5. I was really anxious about you. You should have left home without a word.
某超市一月份的营业额为200万元，已知第一季度的总营业额共1000万元，如果平均每月增长率为x，则由题意列方程应为 [ ]
A、200（1+x）2=100
B、200+200（1+x）2=1000
C、200（1+x）+200（1+x）2=1000
D、200[1+（1+x）+（1+x）2]=1000
