1、第一次why do smokers tend to weigh less than non smokers and gain weight when they give up the habit？Contrry to common knowledge ，non mokers do not generally eat more than smokers，nor do they exercise less，Studies find.researchunless nicotine s metabolic effects I N crease proportional ly with metaboli

2、c rates，its influence on weight be insignificant。now a study shows that nicotine s effects on body-fuel consumption indeed increase proportional ly with increases in activity。“these results indicate Hat the metabolic effect of nicotine may play a greater part in accounting for body-weight difference

3、s between smokers andthe researchers gave a nicotine nose spray to individuals performing light workin this case riding an exercise bicycle modified to allow easy rasythe activity raised resting metabolic rates two three times。By analyzing air breakout，The researchers calculated energy consumption i

4、n The armchair biofore and after giving The nose spray and compared ttemplaterelative to their baseline bicycle expeendatures，Individuals in the nicotine group expeended consider rably more energy than did those in conconergywith nicotine，Perkins says，“it s as if the body is becoming much less effic

5、ient in using its stored energy”while the results may seem discuraging to smokers who d like to quit without gaining weight，Perkins notes that walking an extra day should makeand he says smokers would have to gain the well More than 50 pounds to counter balance the health risks of continued smoking

6、.1.what might common knowledge say about smokers and non smokers？a)smokers eat more and exercise more than non smokers。b)smokers eathers and exercise less than non smokers。c)smokers eathers and exercise more than non smokers。；d)smokers eat more and exercise less than non smokers。答案：c2.when might nic

7、otine influence smokers weight signiantly？a)when nicotine s metabolic effects and metabolic rates increase at the same rate .:B) While smokers are exercising。C) While smokers are at rest。d)when nicotine s metabolic effects increase proportional ly with the amount of light activities。答案：a3.the word“s

8、ubjects”in the fourth paragraph means。A) peopleund medical treatmentB) researchersc)people undersgoing an experiementD) addected smokers答案：c4.what have the researchers found out in their study？a)people in the aramchair expended more energy than people doing desk work。b)people in the control group br

9、eaked out more air。c)people without nicotine nose spray are beoming much less efficient in using energy。d)people in the nicotine group consumerd more energy。:答案：d5.why do the study results seem discuraging to some smokers according to the passage？a)because they want to gain weight to tackle the heal

10、th risks of continued smoking。b)because they want to quit smoking and still keep fit。:c)because they want to walking an extra mile a day to lose some weight。d)because they want to keep fit without having to quit smoking。答案：ba certain amount of controversy has been caused by the publication of a new

11、report by a team of educational ists headed by pro . b . j . Smith。the report Claims to have statistical evidence that children who attend a number of different schools through their parents having to move around thethere are also indications，says professor Smith，of an unusually high rate of psychol

12、ogical dismay among such children。The professor，Who has long suspected that the effect on children whose parents travel to different parts of the country in search of work has not bat“we are not dealing here with opinions”he says， its true，我的個人feeling is that for children s well-being，they should st

13、ay in one school .however，Our findings are based on research and not on any personal attitudes that I or my colleagues may have on the subject。”Capt.thomas muller，an army leturer for the past 20 years and himself a father of two，said， Ive never heard such rubbish .as far as Im concerned，Absolutly no

14、 harm is done to the education of children who change schools regular-as long as they keep to the same syepin my experienceand I ve known quite a few of themarmy children are as well-adjusted as any others，If not moriso。what the professor doesn t appear to apprecate is the fact that in such situations children will adapt much better than adults。”When this was put to professor Smith，he said that at no time had his team suggested that all such children were backward or dismayed in some way“our findings indicate that whi