皮皮学，免费搜题
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【多选题】
根据政府采购法律制度的规定，政府采购可以采用的方式有______。A.
公开招标
B.
邀请招标
C.
竞争性谈判
D.
单一来源采购
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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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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