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1.According to paragraph 1, petroleum is formed in which of the following ways? 【事实信息题】

A Bacteria and tiny plants undergo a change while they are buried in clay.

B Carbon and hydrogen combine to form shale.

C Ocean rocks are converted into organic compounds.

D Oil and gas rise to the surface of sediment and are trapped in rocks.

答案： A

解析：定位句In the ocean, microscopic phytoplankton (tiny floating plants) and bacteria (simple, single-celled organisms) are the principal sources of organic matter that is trapped and buried in sediment. 在海洋中，捕获和掩埋在沉淀物中的微型浮游植物(微型浮游植物)和细菌(简单的单细胞生物)是有机物的主要来源。因此正确答案为A。

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