考场中“怯场”现象是由于（ ）造成的。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31717' and id < 2538775 and id<>'2538775' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31717' and id > 2538775 and id<>'2538775' order by id asc limit 5