根据短文理解，从A、B、C、D四个选项中选择最佳答案填空。

     I had a wonderful time with my exchangeprogram(交流活动中心) in France. It's much 1 than I thought. I felt a little nervous before I reached France, but there wasn't any reason to be so. My host 2 is really nice.

     They managed various ways to make me 3 at home. Every day I 4 practicing 5 French, I wouldn't believe how 6 progress I 7 in French! Although I still make some mistakes, I can think something in French without

    8  everything into Chinese like I used to. My biggest challenge is learning how to behave at dinner table. All the things are really different 9 the way they are at home. You are not supposed to eat anything with your hands except bread. Another thing is that 10 is very rude to say “I'm full now.” you should say “It is delicious." instead.

在如图所示的电路中，R₁为定值电阻，L为小灯泡，R_T为半导体热敏电阻（当温度升高时电阻减小），则当R_T的温度降低时（  ）

热机工作时，能量的转化过程是（  ）

    There are many weight loss products，plans and programs in the market.However,if most of these programs were effective，we would see obesity trends reversing,yet we are witnessing more and more people struggling with weight.

    Experiences of dieters regaining pre-dieting weight within 5 years are common.Therefore,a fitness program that works over a long period of time is something you should be looking for.Before reaching for your wallet or purse,make sure the program is exactly what it claims to be.

Professional endorsement(认可)

    A good program should not insist on offering pills, injections, powders or similar products that are not endorsed by a medically trained professional.You choice of programs should have been designed by a medically trained professional.

Unreallstic promises

    A good program should not make unrealistic promises，such as“To lose 5 pounds in a week,with no exercise!” Therefore,it is advisable to judge whether the promises being made are realistic.The plan should also have a high success rate of weight loss.

Qualification

    A weight loss program should consider the health of the applicants.It should consider their age,medical condition,gender,health background，medication and more,in order to make a plan that meets the needs of every applicant.A good program should include diet and exercise in order to promote permanent and good health.

Restriction

    A good program should not overly restrictive(限制的)on food allowances.Some programs ask you not to eat foods from the main nutrient food groups like fruit and vegetables.A successful weight loss plan,for most people,should not involve less than 1,200 calories per day.

Cost effective

    A long-term program does not have to cost you lots of money.An effective plan that is reasonably priced can save you a large sum of money that can be spent on other healthy habits.This car in turn improve your lifespan.

    We provide the best information about weight loss program.For further details please visit the provided links.