独立的幼儿教育机构出现于
A.封建社会
B.社会主义社会
C.资本主义社会
D.原始社会
参考答案:C
He ______ this dictionary for 5 years. He ______ it in 2004. [ ]
A. has bought; bought
B. bought; bought
C. has kept; has bought
D. has had; bought
()是航天保险的承保标的。
A.航天产品的质量责任
B.航天产品的使用寿命
C.航天部件坠落造成的第三方损失
D.航天信誉