听力原文：How is index used to measure the changes in economy?
(31)
A.They use unemployment rates to judge the decline measured by the index.
B.They use the interest rates to confirm the growth of economy.
C.They use percentage to represent the changes weighed by the index.
D.They use stocks as the measurement of development in market.

A.They
B.
B.They
C.
C.They
D.
D.They
E.

【参考答案】

C
解析：本题问“怎样使用指标来衡量经济中的变化?”短文提到，The changes measured by a......

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