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下列说法正确的是……………………………………………………( )

A．对于人体必需的微量元素，摄人量越多越有利于人体健康

B．羊毛、棉花属于天然纤维

C．用pH试纸测出正常雨水的pH为5．6

D．合成纤维、合成橡胶和合金都属于合成材料