有"黄金之国"之称是指哪一个国家？（）
A.美国
B.沙特阿拉伯
C.埃及
D.南非
参考答案：D
_____ no modern technology, the Egyptians had to move each stone by hand.[ ]
A. It being
B. There being
C. There was
D. Being
使用鼻罩持续气道正压通气的常见副作用是（）
A.气道陷闭
B.鼻充血
C.嗜睡
D.打鼾
E.心律失常
