Help: How do you reduce the parse/executions ratio?

In our database, there are quite some high ratio parse/executions sql,even though we are already using bind variables. here are a few examples

SELECT ROADWAY_ID,ALIAS_CODE,ALIAS
FROM V_ROADWAY_ALIAS
WHERE ROADWAY_ID = :b1
AND METRO_ID = :b2 AND ALIAS_CODE = :b3 AND ALIAS_LEVEL = :b4

parse 1129, executions 1129

The libray hit ration is 99% and we have fairly big shared_pool, could somebody help me?

Your help is highly appreciated.  

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