1. What is the topic of the passage?
2. Where was ice used after the Civil War?
3. What was essential to a science of refrigeration according to the passage?
4. It can be inferred from the passage that the theoretical foundation of ice box should be that
5. Without an ice box, farmers had to go to the market at night because 第2页:答案
Designated driver services booming in big cities
Inspectors eye rules for family planning
Iran shrugs off EU oil embargo
Temple sued by daughter of monk
Mars rover to find out if we're alone
Violence in Syria escalates
Most wanted Nazi suspect found in Budapest
Syrian PM defects to opposition
Well-known US magazine may be quitting Chinese market
Hostages finally come home
Monsoon floods in India kill 81, displace 2 million
US-Philippines drill fuels tension
The real home of the Games
Adidas to open 600 more stores
Sewage discharged into rivers
Bombing strikes Assad's inner circle
Yeah! She Won
Star wants to attract more soccer talent from abroad
UK: 3,500 more troops assigned to Olympics
Doctors grow vein with girl's own stem cells
Chinese frigate safely refloated
Tight security on an Olympic scale
Golden moments may be fewer in London
Olympics to test London's subway
Shopping marathon in store at Olympics
Gold-trading ring took in billions
Rescued fishing vessel heads to Tanzania
It's not doping that wins races, Sun says - it's lots of hard work
Japan calls ambassador back for day
Capital issues fresh warning of rain
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