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【多选题】
土壤有机质在改善土壤性质、调节土壤肥力上有（）作用？A.
土壤有机质可以提高土壤的供肥性
B.
土壤有机质可以提高土壤的保肥性，因而可提高化肥利用率
C.
土壤有机质可以改良土壤的多种物理性状
D.
促进植物生长发育
E.
有助于消除土壤污染，提高土壤自净能力
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皮皮学刷刷变学霸
举一反三
【单选题】Mary shouted at the top of her voice ______ because there was so much noise aroundher.
A.
making herself hear
B.
to make herself hear
C.
making herself heard
D.
to make herself heard
【单选题】The girl who is singing has a(n) _ voice. I love her songs very much. [ ]
A.
happy
B.
ugly
C.
sweet
D.
strange
【简答题】A．The woman doesn't look after her voice. B．Talking and laughing can damage your voice as much as singing. C．Talking slowly helps protect your voice. D．The woman occasionally works on weekends.
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