Some blood types are quite common, others are regionally        , and still othe

Some blood types are quite common, others are regionally        , and still othe

题型:不详难度:来源:
Some blood types are quite common, others are regionally        , and still others are rare everywhere.
A.distributedB.contributedC.obtainedD.Convinced

答案
A
解析

试题分析:考查动词辨析。句意:一些血型很常见,而有一些呈地区分布,但仍有少量血型很罕见。distribute分布;分配;contribute;贡献;有助于;obtain得到;获得;convince使信服;确信。根据句意可知A项正确。故选A。
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