题目

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：B空气的成分中，按体积分数计算最多的气体是  A．氮气           B．氧气              C．二氧化碳             D．稀有气体