Most birds （）their wings up and down,but humming birds move their wings in a figure-eight pattern. ( 章节：2 难度：3)
- A、counter
- B、moderate
- C、relive
- D、flap
正确答案:D
答案解析:有
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Most birds （）their wings up and down,but humming birds move their wings in a figure-eight pattern. ( 章节：2 难度：3)
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