Some blood types are quite mon,others are regionally ,and still others are rare everywhere.
A. distributed
B. contributed
C. obtained
D. convinced
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(答案→)A. distributed
B. contributed
C. obtained
D. convinced
解析:此题考查动词辨析。distribute“分散,分布”;contribute“贡献;导致”;obtain“得到”;convince“使某人确信;使某人明白”。句意:一些血型很普通,一些只分布在局部地区,另外还有一些哪儿都很罕见。由句意可知A项正确。