听力原文:How much money did the company earn last year? (A) We made three hundred thousand dollars. (B) Money earns interest during the year. (C) We spent a lot of money. (32)
A.
B.
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【简答题】标出各元素的氧化数: C O、 C O 2 、 C H 4 、 C 2 H 5 OH、 P I 3 、 N I 3、 Fe 3 O 4 、Na 2 O 2、 K O 2