31. What is depicted on the y-axis of this country-dot-animation?
(A) Y = housing price index (1980 = 100)
(B) Y = carbon emissions (CO2-equivalent tonnes per person)
(C) Y = life expectancy (years)
(D) Y = adult literacy rate (percentage)
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統計: A(4), B(7), C(4), D(1), E(0) #2160245
統計: A(4), B(7), C(4), D(1), E(0) #2160245