题干
Chinese Premier Wen Jiabao, in_________ interview with Hong Kong reporters on April 13, said that Chinese economy in ________ first quarter showed signs of better than expected positive changes.
A：an, 不填
B：the, the
C：the, a
D：an, the
答案(点此获取答案解析）
B
2C+D 的反应来说，以下化学反应速率的表示中反应速率最快的是（ ）
