题型：单选题 难度：★★★ 
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according to schroeder, the topsoil of a standard green cemetery should be a biological hotbed.
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it is not the law but the cemeteries that require cemetery vaults and grave liners.
before the commercial funeral industry became popular, people used to practise green burials.
traditional jewish principles regard embalming as an offense to the dead.
at present, compared with the united states, great britain has done a better job in increasing the popularity of green cemeteries.
people under the exposure of formaldehyde every day are more likely to get leukemia and brain cancer.