The audience fixed their eyes on the magician, about how he performed the magic trick.A.

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(答案→)A. curious
B. anxious
C. astonished
D. upset
解析：句意为：观众把目光盯在魔术师的身上，对他表演的魔术很好奇。curious adj 好奇的，稀奇的；anxious adj紧张的，焦虑的；astonish adj 令人吃惊的；upset adj心烦的，忐忑不安的。be curious about 对---很好奇。故答案应为A。