石油生成于沉积岩中，而且绝大多数都储集在（）中。
A、岩浆岩
B、变质岩
C、沉积岩
D、碎屑岩
参考答案：C
The young man made a to his parents that he would try to earn his own living after graduation. [ ]
A.prediction
B.promise
C.plan
D.contribution
下列各项，急性白血病高热的主要病因是
A．代谢亢进
B．化疗反应
C．白血病细胞浸润
D．广泛出血
E．合并感染
