（）是提高社会生产力和综合国力的战略支撑，必须摆在国家发展全局的核心位置。
A、科技创新
B、文化创新
C、理论创新
参考答案：A
_______the thick clouds, you would find the kite in the sky easily.
A．Had it not been for
B．If it were not
C．If it had not been for
D．Were it not for
室间隔缺损的血流动力学改变首先引起（）
A.右室增大
B.左房增大
C.主动脉扩张
D.肺动脉扩张
E.以上都不是
