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Conventional deposits of oil and gas are actually the final resting place of far-traveled hydrocarbons that were (i)_____ deeper source beds of organic-rich rock. By contrast, shale gas (ii)_____ its birthplace, remaining in the source bed whose organic matter produced the gas.
- Blank(i)
- trapped in
- generated in
- bound for
- Blank(ii)
- never leaves
- swiftly escapes from
- rarely stays in
generated in , never leaves 显示答案
以上解析由 考满分老师提供。
