皮皮学，免费搜题
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【单选题】
礼仪的内核是()A.
礼貌
B.
礼节
C.
修养
D.
文化
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】n. 丑闻 首字母s
【单选题】关于二次函数y=ax 2 +bx+c （a≠0）的图象有下列说法： ①当c=0时，函数图象经过原点；②当b=0时，函数图象关于y 轴对称；③函数图象最高点的纵坐标为 ；④当a>0时，y随x的增大而增大，其中正确的个数有 [ ]
A.
1个
B.
2个
C.
3个
D.
4个
【单选题】The main reason why two major airlines went bankrupt recently was that
A.
the recession had reduced the overall number of air passengers.
B.
the companies failed to attract an adequate number of passengers.
C.
competitions from other airliners took away all their trade.
D.
they introduced cheap flights for all categories of passengers.
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