Sulphur has occasionally been found in the earth in an almost pure state.

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问题 Sulphur has occasionally been found in the earth in an almost pure state.

选项 A、regularly
B、accidentally
C、sometimes
D、successfully

答案C

解析

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Sulphur has occasionally been found in the earth in an almost pure state.

职称英语理工类基础

职称英语

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Onaveragewomenlivedlongerthanmen100-yearsago.Peoplenowenjoylongerlivesforunknownreasons.

OneoutoffiveAmericanchildrensuffersfromdyslexia.Itisbelievedthatdyslexiaisrelatedtothebadhabitsofababy’s

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