[求助]刚接触ＧＷＤ－暈—求助

GWD-24-15.

Healthy lungs produce a natural antibiotic that protects them from infection by routinely killing harmful bacteria on airway surfaces. People with cystic fibroses, however, are unable to fight off such bacteria, even though their lungs produce normal amounts of the antibiotic. Since the fluid on airway surfaces in the lungs of people with cystic fibrosis bas an abnormally high salt concentration, scientists hypothesize that in high salt environments the antibiotic becomes ineffective at killing harmful bacteria.

Which of the following, if it were obtained as an experimental result, would most decisively undermine the scientists’ hypothesis?

1. Healthy lungs in which the salt concentration of the airway-surface fluid has been substantially increased are able to reestablish their normal salt concentration within a relatively short period of time.

2. The antibiotic produced by the lungs is effective at killing harmful bacteria even when salt concentrations are below levels typical of healthy lungs.

3. The salt concentration of the airway-surface fluid in the lungs of people who suffer from cystic fibrosis tends to return to its former high levels after having been reduced to levels typical of healthy lungs.

4. The lungs of people who suffer from cystic fibrosis are unable to fight off harmful bacteria even when the salt concentration is reduced to levels typical of healthy lungs.

5. The salt concentration in the airway-surface fluid of people whose lungs produce lower-than-average amounts of the antibiotic is generally much lower than that typical of healthy lungs.

which of the following most logically completes the argument below?

According to promotional material published by the city of Springfield, more tourists stay in hotels in Springfield than stay in the neighboring city of Harristown. A brochure from the largest hotel in Harristown claims that more tourists stay in that hotel than stay in the Royal Arms Hotel in Springfield. If both of these sources are accurate, however, the “Report on Tourism” for the region must be in error in stating that   .

1. the average length of stay is longer at the largest hotel in Harristown than it is at the Royal Arms Hotel.

2. There is only one hotel in Harristown that is larger than the Royal Arms Hotel.

3. More tourists stay in hotels in Harristown than stay in the Royal Arms Hotel.

4. The Royal Arms hotel is the largest hotel in Springfield

5. The royal arms hotel is the only hotel in Springfield.

Fish currently costs about the same at seafood stores throughout Eastville and its surrounding suburbs. Seafood stores buy fish from the same wholesalers and at the same prices, and other business expenses have also been about the same. But new tax breaks will substantially lower the cost of doing business within the city. Therefore, in the future, profit margins will be higher at seafood stores within the city than at suburban seafood stores.

For the purposes of evaluating the argument, it would be most useful to know whether.

(A)  more fish wholesalers are located within the city than in the surrounding suburbs.

(B)  Any people who currently own seafood stores in the suburbs surrounding Eastville will relocate their businesses nearer to the city

(C)  The wholesale price of fish is likely to fall in the future

(D)  Fish has always cost about the same at seafood stores throughout Eastville and its surrounding suburbs.

(E)   Seafood stores within the city will in the future set prices that are lower than those at suburban seafood stores.