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【单选题】
Attaching significance to an object can _____.
A.
decrease performance
B.
improve performance
C.
cause stress
举报
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Apples and onions are good for athletes because they contain _____.
A.
quercetin
B.
Vitamin D
C.
protein