逻辑问题~~~大家帮帮忙~~~

liuyanxin

天山里的两道题~~~不是很明白~~
1.In responce to mounting public concern, an airplane manufacturer implemented a   program with the well-publicized goal of reducing by half totle yearly amount of hazardous waste generated by its passenger-jet division. When the program begin in the 1994, the dividence hazardous waste output was 90 pound per production worker, last year it was forty pounds per production worker.Clearly, therefore, charges that the manufacturer's program has not met its goal are false.
Which of the following is an assumption on which the argument depends?
A.The amount of nonhazardous waste gernerated each year by the passenger-jet division has not encreased significantly since  1994.
B. At least as many passengers jets were produced by the division last year as had been produced in 1994.
C. Since 1994, other divisions in the company have achieved reductions in hazardous output that are at least equal to that achieved in the passenger-jet division .
D. The average number of weekly hour per production worker in the passenger-jet division was not significantly greater last year than it was in 1994.
E. The number of production workers assigned to yhr passenger-jet division was not significantly less in 1994 than it was last year.
这一道为什么 选B不选E那？
  
2. Vorland's government is planning a nationwide ban on smoking in restaurants. The objection that the ban would reduce restaurants' revenues is ill founded. Several towns in vorland enacted restaurant smoking restrictions five years ago. Since then , the amount the government collects in restaurant meal taxes in those towns have increased 34 percent , restaurant meal tax closely reflects restaurants' revenues.
Which of the following, if true, most undermines the defense of the government's plan?
A. When the state first imposed a restaurant meal tax, opponents pridicted that restaurants' revenues would decline as a result, a prediction that proved to be correct in the short term.
B. The tax on meals on restaurants is higher than the tax on many other goods and services.
C. Over the last five years , smoking has steadily declined throughout Vorland.
D. IN many of the towns that restrict smoking in restaurants,restaurants can maintain separate rooms dining areas where smoking is permitted.
E. Over the last five years, government revenues from sales taxes have grown no faster in the towns with restaurant smoking restrinctions than in the towns that have no such restrictions.
这道选D。不明白~~~~