NO.PZ2023061903000004
问题如下：
Q. The indicator indexes created by various organizations or research agencies:选项：
A.include only leading indicators to compute their value. B.are highly reliable signals on the phase of business cycles. C.evolve over time in terms of composition and computation formula.解释：
C is correct. The indicator indexes are constantly updated for their composition and methodology based on the accumulation of empirical knowledge, and they can certainly include more than just leading indicators.
B为什么不对呢？
