23. What is one of the main environmental benefits of urban green spaces?
(A) They reduce the risk of natural disasters.
(B) They absorb harmful gases and produce oxygen.
(C) They promote the growth of urban infrastructure.
(D) They create more space for urban development.
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統計: A(83), B(602), C(88), D(65), E(0) #3340993
統計: A(83), B(602), C(88), D(65), E(0) #3340993