However，if you are practiced in a task，it is unlikely your performance will be affected.If you regularly do a crossword，you are going to be fine.But if it is something that is new to you，you are probably not going to do it well.This explains why commercial pilots’ thinking is not impaired.

　　Professor Gradwell said his advice could become even more important if Internet access becomes widespread on planes，meaning businessmen and businesswomen are more likely to use flying time to work.“Those looking forward to having e­mails in flight might want to think twice about sending that email to the manager，” he said.

　　The condition，called “economy class syndrome(经济舱综合症)”，has caused anxiety among holiday­makers，business people and frequent fliers.But Mr.Gradwell said it is extremely rare，other than in those who have late­stage cancer or another medical condition that causes blood clots(凝血块)．Flying is safe.Millions of people do it every year，without any issues at all.

　　1．According to the passage，while on a plane，

　　.

　　A．the brain’s performance has nothing to do with the air pressure

　　B．the brain’s performance will be reduced

　　C．the passengers can take in enough fresh air to relax

　　D．it’s dangerous for the pilots as well as passengers

　　答案　B

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