单项选择题

A．Wearing down the soil.
B．Building up land.
C．Enriching the soil.
D．Loosening more earth.
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单项选择题
The author did not learn of the unemployment problem until 1928 because _______.
A．he had spent his childhood in Burma
B．people in Burma hardly talked about unemployment
C．the English economy collapsed after he had gone abroad
D．England had been enjoying economic prosperity while he was in Burma
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