能选择性阻断a2受体的药物是（    ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27508' and id < 2269893 and id<>'2269893' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27508' and id > 2269893 and id<>'2269893' order by id asc limit 5