保护旅游资源意义何在?
参考答案:
保护旅游资源是旅游业能够兴旺发展的根本保证。
________him that she would fail as she was so able and worked so hard.[ ]
A.It never occurred to
B.That never occurred to
C.It never occurred with
D.That never occurred for
脑栓塞的常见病因为()
A.常见病因为慢性喘息性支气管炎
B.常见病因为风湿性心脏病
C.常见病因为冠状动脉粥样硬化性心脏病
D.常见病因为高血压、动脉硬化
E.常见病因为脑动脉瘤、脑血管畸形