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题干：根据《旅游法》规定，国家建立健全旅游服务标准和市场规则，禁止行业垄断和地区垄断。旅游经营者应当诚信经营，公平竞争，承担社会责任，为旅游者提供（）的旅游服务。A.
安全
B.
健康
C.
卫生
D.
方便
E.
周全
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举一反三
【单选题】From the sentence “She stood by the window and looked out at a grey cat walking along a grey in a grey backyard.” we can infer that Della was very______.
A.
angry
B.
calm
C.
happy
D.
Sad
【单选题】In the story "The Gift of the Magi" by O · Henry, from the sentence “She stood by the window and looked out at a grey cat walking along a grey in a grey backyard.” we can infer that Della was very ( ...
A.
angry
B.
c alm
C.
s ad
D.
happy
【单选题】How did the Della react when she saw Jim gasp in surprise?
A.
She was very calm
B.
She was worried that Jim would be angry.
C.
She was excited and happy
D.
She was sad that she lost her hair
【简答题】首次进行胚芽鞘向光性实验的人是
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