下列选项中，不属于当代中国法律渊源的是( )。
A．判决书
B．地方性法规
C．规章
D．国际惯例
参考答案：A
旅游资源除了有形的之外，不包括旅游服务、社会制度、人民生活方式等无形的内容。（）
The achievements of the greatest minds in science could never have been reached if it had not been for the patient and accurate work of hundreds of other people.
A．has it not been
B．if it had been
C．if hasn't been
D．had it not been
