A:设计这个小鸟没有什么必要
B:这个小鸟的设计只是为了美观
C:小鸟的设计浪费了材料
D:小鸟的设计既增加了水壶的美观,又非常实用
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请根据以上信息,选择正确答案,将其标号在答题卡上涂黑。
There are enough cups for each visitor to have _______.
Mary didn't go to school yesterday. ____ ____ ____ she had a cold.