[单选题]Napping to aHealthier Heart?1 Researchers saythey have developed a simple t
[单选题]Most of what Ireally need to know about how to live and what to do and how
[单选题]Icebergs areamong nature's most spectacular（壮观的）creations , and yet most pe
[单选题]Young adults who arefit have a higher IQ and are more._________(51)to go on
[单选题]College Night OwlsHave Lower GradesCollege students whoare morning people t
[单选题]The United Statesperceives itself to be a middle-class nation.However,middl
[单选题]Preserve theEnvironmentThroughout historyman has changed his physical envir
[单选题]Health care in the US is wellknown but very expensive.Paying the doctor's b
[单选题]My friend's replywas [courteous] but firm.A.efficientB.respectableC.well-in
[单选题]The volume oftraffic in many cities in the world today continues to expand.
[单选题]Research [indicates]that over 81% of teachers are dissatisfied with their s
[单选题]Few men haveinfluenced the development of American English to the extent th
[单选题]Natural MedicinesSince earliestdays,humans have used some kinds of medicine
[单选题]With only oneother child in the new neighborhood,Irene felt [isolated] and
[单选题]Men Too May SufferFrom Domestic Violence Nearly three in 10 men have experi
[单选题]Step Back in TimeDo you know that welive a lot longer now than the people w
[单选题]New Changes inAmerican LifeOnce it was possibleto define male and female ro
[单选题]Trying to Find aPartnerOne of the moststriking findings of a recent poii in
[单选题]It is well-knownthat life expectancy is longer in Japan than in most other
[单选题]Sleep DeficitJudging from recentsurveys,most experts in sleep behavior agre
[单选题]Stomach UlcerStomach ulcers arethe cause of severe pain for many people. Do
[单选题]The ForeignService is a [branch] of the Department of State.A.centerB.divis
[单选题]In every cultivatedlanguages there are two great classes of words which tak
[单选题]In the early days ofthe United States,postalcharges were paid by the recipi
[单选题]Step Back in TimeDo you know that welive a lot longer now than the people w
[单选题]Police havealready [identified] around 10 murder suspects.A.targetedB.disti
[单选题]Cooking Oil FumesCause TumorThe leading cause oflung cancer among women in
[单选题]It's [inevitable]that doctors will make the occasional mistake.A.strangeB.c
[单选题]HospitalMistreatmentAccording to astudy,most medical interns report experie
[单选题]Egypt is an [ancient] nation withrich culture.A.ancestralB.mysteriousC.magn