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【单选题】
两个“等差数列”的和组成的数列为：A.
等比数列
B.
等差数列
C.
普通数列
D.
不一定是等差数列
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反馈参考答案：
举一反三
【简答题】发展 是可持续发展的前提和基础, 公平性 是实现可持续发展的尺度, ( ) 是实现可持续发展的保证。
【简答题】阅读理解。 After we finished thir miles of hiking, we were tired and our muscles ached as we made our way back to New England. The car ride to the airport followed by a two-hour flight left our legs mo...
【简答题】韩国的首都是:
【简答题】Hot the night air was, we slept deeply because we were so tired after the long journey.
【简答题】After we finished thir miles of hiking, we were tired and our muscles ached as we made our way back to New England. The car ride to the airport followed by a two-hour flight left our legs more wor...
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