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【单选题】
焦亚硫酸钠作为抗氧化剂,常用于()。
A.
偏酸性溶液
B.
偏碱性溶液
C.
中性溶液
D.
弱碱性溶液
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【单选题】If those "mad moments"— when you can’t recall what your friend has told you or where you left your keys—are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies r...
A.
everyone can be forgetful sometimes regardless of one’s age
B.
we can prevent our sound mind from aging with certain methods
C.
brain aging starts from the time when we are in our 20s and 30s
D.
memory loss is a sign that shows we are getting old
【单选题】饮茶能延缓皮肤的衰老，尤其是绿茶，因为绿茶比其他茶类含有更丰富的 等强抗氧化剂。
A.
茶多酚与维生素 C
B.
维生素 C 与咖啡碱
C.
茶氨酸 与维生素 E
D.
茶皂素 与类胡萝卜素
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【单选题】If those "mad moments"— when you can’t recall what your friend has told you or where you left your keys—are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies r...
A.
everyone can be forgetful sometimes regardless of one’s age
B.
we can prevent our sound mind from aging with certain methods
C.
brain aging starts from the time when we are in our 20s and 30s
D.
memory loss is a sign that shows we are getting old
【单选题】饮茶能延缓皮肤的衰老，尤其是绿茶，因为绿茶比其他茶类含有更丰富的 等强抗氧化剂。
A.
茶多酚与维生素 C
B.
维生素 C 与咖啡碱
C.
茶氨酸 与维生素 E
D.
茶皂素 与类胡萝卜素
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