It will be many years ______ the doctors and medical scientists can find _____ for cancer.

    A . since; cures              B. when; treatments 

C. before; cures             D. until; treaments

When the world was a simpler place ,the rich were fat ,the poor were thin ,and right-thinking people worried about how to feed the hungry .Now ,in much of the world ,the rich are thin ,the poor are fat ,and right-thinking people are worrying about fatness.?
Evolution（进化）is mostly to blame. It has designed mankind to deal with lack ,not plenty .People are perfectly fit to store energy in good years to see them through lean ones. But when bad time never comes ,they are stuck with that energy ,stored around their expanding bellies.?
Thanks to rising agricultural productivity ,lean years are rarer all over the globe .According to the UN ,the number of people short of food fell from 920 m in 1980 to 799 m 20 years later ,even though the world's population increased by 1.6 billion over the period .This is mostly a cause for celebration .Mankind has won what was ,for most of his time on this planet ,his biggest battle：to ensure that he and his offspring had enough to eat. But every silver lining has a cloud ,and the result of prosperity is a new trouble.?
Fatness is the world's biggest public-health topic today—the main cause of heart disease ,which kills more ?people? these days than AIDS ,malaria（疟疾）,war; the major risk factor in diabetes（糖尿病）；heavily connected with cancer and other diseases .Since the World Health Organization labeled fatness an “epidemic（流行病）”in 2000,?reports? on its fearful results have come thick and fast.?
Will public-health warnings ,combined with media pressure ,persuade people to get thinner ,just as they ?finally? put them off tobacco? Possibly .In the rich world ,sales of healthier foods are booming and new figures suggest that over the past year Americans got very slightly thinner for the first time in recorded history .But even if Americans are losing a few ounces ,it will be many years before the country solves the health problems caused by half a century's dining to overload .And ,everywhere else in the world ,people are still piling on the pounds .That's why there is now an agreement among doctors that governments should do something to stop them.?
1.What's the main idea the writer intends to tell us in this passage??
A.It's harmful to have enough to eat.?
B.It's better to be thin than fat.?
C.Fatness is the greatest danger in the world.?
D.Fatness has become a great health problem.
2.It can be inferred from the passage that the biggest problem in history is_______.
A.people were thin?
B.people smoked heavily?
C.there was not enough food to eat?
D.people stored energy in good years
3.Why does the author compare smoking with the fat problem in this passage??
A.Because they are both difficult problems to be settled.?
B.Because they both lead to the same diseases.?
C.Because they are both bad habits.?
D.Because they are both harmful to health.
4.Which of the following is TRUE according to this passage??
A.Man has got rid of lean years by increasing agricultural productivity.?
B.Though fatness is a difficult problem ,man may break away from it.? C.Fatness may cause many diseases such as heart disease ,AIDS and cancer.?
D.The fat problem won't be settled until governments take measures.

It will be many years ______ the doctors and medical scientists can find _____ for cancer.

    A . since; cures              B. when; treatments 

C. before; cures             D. until; treaments

Today our lives are changing faster than at any time in history. Here we report on three important changes that will have a big impact on our everyday lives in the future．
The cashless society 
Cash and bank-notes will disappear almost completely. They will be replaced by smart cards, namely plastic cards: microchip（微芯片）processors（处理器）loaded with some money. When we pay for goods，the shop assistant will put our smart card into a payment terminal（终端）and money will come into his card from our card. When all the money is used up，we will be able to reloadit by putting it into a telephone，dialing our bank account and money will be put into the card from the account.
Interactive telephones 
Talking computers will play an important part. They will recognize speech, ask us what information we need, look through a database，and put the information into speech．If we want to book a flight or pay a bill by phone, we will interact with a talking computer to do so. Human telephone operators will be used only for more complex operations such as dealing with complaints or solving special problems.
Traffic jams in cities will be reduced because drivers will use electronic route maps to find the quickest route to their destination. Electronic systems will start changing motorists for driving in cities．As soon as motorists have to pay to drive in cities, they will stop using their cars and use public transport instead. Speed control systems will be built into cars. These systems will automatically（自动地）regulate the speed of the car to take account of traffic and weather conditions and prevent accidents. It will be many years before these changes bring results but when they do，there will be a titanic improvement in road safety.
With the development of science and technology, more and more advanced things will be invented or created. Life in the future is undoubtedly different from that at the present.
【小题1】Cash and bank-note will disappear because         .

It will be many years ______the doctors and medical scientists can find _____ for cancer.