石油主要产于腐殖型有机质。
参考答案：对
The train ________ arrive at 1:30, but it was an hour late.
A. was about to
B. was likely to
C. was certain to
D. was supposed to
福建历史上第一位诗人是（）。
A.薛令之
B.欧阳詹
C.黄滔
D.郑露
