According to the passage，some scientists believe that a dose of one rem of radiation continued over a period of generations would( ) A.raise the strontium 90 levels in the body but otherwise have little effect B.relieve the acute suffering of those afficted with arthritis of the spine without side effects C.have the effect of increasing by 1 percent the cases of serious genetic defects D.cause an additional 1 ，000 per million cases of cancer of the bone marrow or lymphatic system
According to the passage，some scientists believe that a dose of one rem of radiation continued over a period of generations would( )
A.raise the strontium 90 levels in the body but otherwise have little effect
B.relieve the acute suffering of those afficted with arthritis of the spine without side effects
C.have the effect of increasing by 1 percent the cases of serious genetic defects
D.cause an additional 1 ，000 per million cases of cancer of the bone marrow or lymphatic system
B.relieve the acute suffering of those afficted with arthritis of the spine without side effects
C.have the effect of increasing by 1 percent the cases of serious genetic defects
D.cause an additional 1 ，000 per million cases of cancer of the bone marrow or lymphatic system
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已知某国国际收支平衡表中，经常项目差额160亿美元，资本和金融项目差额为-100亿美元，误差与遗漏为1o亿美元，则该国储备资产增减额为（ ）。A.70亿元B.-70亿美元C.+60亿美元D.+270亿美元