[单项选择]第一篇 U．S．Blacks Hard-hit by Cancer Death rates for cancer are falling for all Americans，but black Americans are still more likely to die of cancer than whites，the American Cancer Society said Monday． In a special report on cancer and blacks．the organization said blacks are usually diagnosed with cancer later than whites．and they are more likely to die of the disease．This could be because of unequal(不平等的)access to medical care，because blacks are more likely to have other diseases as well，and perhaps because of differences in the biology(生物学) of the cancer itself, the report added． “In general，black Americans have less hope of surviving five years after diagnosis than whites for all cancer sites and all stages of diagnosis,”the report said． “In describing cancer statistics for black Americans，this report recognizes that many of the differences associated with race may be caused by unfair social and economic differences and unequal access to medical care．” Th
A. people in other countries．
B. white Americans．
C. a11 other Americans．
D. their ancestors．

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