C．helpingD．hurting

18．A.honourB．favour

C．pleasureD．lesson

19．A.someoneB．something

C．anyoneD．everything

20．A.innocentB．successful

C．guiltyD．reliable

.阅读理解

(2010·四川绵阳高三诊断性测试)

Therearenewfindingsthatnotenoughsleepmaycausepeopletogainweight.Researcherssayalackofsleepcanproducehormonal(激素的)changesthatincreasefeelingsofhunger.

Inonestudy，researchersintheUnitedStatesexaminedinformationonmorethan1,000people.Thepeoplehadtakenpartinalong­termstudyofsleepdisorders.

Somepeoplesleptlessthanfivehoursanight.Theyhad15percenthigherbloodlevelsofahormonecalledghrelinthanpeoplewhoslepteighthours.Andtheyhad15percentlessofthehormoneleptin.Expertssayghrelinhelpsmakepeoplefeelhungry；leptinmakesyoufeelfull.

Thescientistssaythesehormonalchangesmaybeacauseofobesity(肥胖症)inWesternsocieties.Theynotethecombinationthatsleeplimitationiscommonandfoodiswidelyavailable.

Theresultswerenotaffectedbyhowmuchpeopleexercised.Peoplewhoareawakelongerhavemoretimetoburnenergy.Buttheresearcherssaylossofsleepmayincreasehungerespeciallyforhigh­caloriefoods，sopeoplegainweight.Itseemsthat，forsurvival，thebodymaybedesignedtostoremorefatduringtimeswithlesssleep.

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