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【单选题】
工、农业及城市生活污水中含磷。家用洗涤剂是污水中磷的一个重要来源（洗涤剂中含有磷酸钠）。关于处理污水时要不要除去磷的说法正确的是（）A.
磷是生物所需的营养元素，不必除去
B.
含磷的污水是很好的肥料，不必除去
C.
含磷污水排到自然水中引起藻类增殖，使水变质，必须除去
D.
磷对人无毒，除去与否都无关紧要
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A.
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B.
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C.
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D.
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【单选题】When the delegates come, ______ help them sign the Registration Cards and collect their room keys.
A.
receptionists
B.
room attendants
C.
sales managers
D.
security guards
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