消费者购买行为与价值观念受到许多社会因素的影响,这些因素主要包括社会文化、社会阶层、社会群体以及()。
A.年龄
B.民族
C.个性
D.家庭
E.审美
参考答案:B, D
He lost both of his parents in the big earthquake, but for him, a kind couple adopted him and took good care of him.
A.suddenly
B.naturally
C.obviously
D.luckily
施工中发现影响施工的地下障碍物时,承包人应于( )内以书面形式通知工程师。
A.4小时
B.8小时
C.12小时
D.24小时