按岛屿自然形成的成因,夏威夷群岛属于()。
A、冲积岛
B、珊瑚岛
C、火山岛
D、大陆岛
参考答案:C
Thousands of athletes______ in many countries will compete _______ medals in the 2008 Olympic Games in Beijing.
A.involved; in
B.involving; by
C.to involve; against
D.involved; for
我国车站计算机联锁系统的研制生产单位为()、()、()和()。