求教几道prep的逻辑题

saber0425

From 1978 to 1988, beveragecontainers accounted for a steadily decreasing percentage of the total weightof household garbage in the United States. The increasingly widespread practice of recycling aluminum and glass wasresponsible for most of this decline. However, although aluminum recycling was more widely practiced in thisperiod than glass recycling, it was found that the weight of glass bottles inhousehold garbage declined by a greater percentage than the weight of aluminumcans.

Which of the following, if true ofthe United States in the period 1978 to 1988, most helps to account for thefinding?

(A) Glass bottles are significantlyheavier than aluminum cans of comparable size.

(B) Recycled aluminum cans werealmost all beverage containers, but a significant fraction of the recycledglass bottles had contained products other than beverages.

(C) Manufacturers replaced manyglass bottles, but few aluminum cans, with plastic containers.

(D) The total weight of glassbottles purchased by households increased at a slightly faster rate than thetotal weight of aluminum cans.

(E) In many areas, glass bottleshad to be sorted by color of the glass before being recycled, whereas aluminumcans required no sorting.

这道题个人不知道C为什么是对的。。。。自己选的是A

24. (29155-!-item-!-188;#058&003857)

Tiger beetles are such fast runnersthat they can capture virtually any nonflying insect.  However, when running toward an insect, thebeetles intermittently stop, and then, a moment later, resume theirattack.  erhaps they cannot maintaintheir pace and must pause for a moment's rest; but an alternative hypothesis isthat while running tiger beetles are unable to process the resulting rapidlychanging visual information, and so quickly go blind and stop.

Which of the following, ifdiscovered in experiments using artificially moved prey insects, would supportone of the two hypotheses and undermine the other?

(A) When a prey insect is moveddirectly toward a beetle that has been chasing it, the beetle immediately turnsand runs away without its usual intermittent stopping.

(B) In pursuing a moving insect,the beetles usually respond immediately to changes in the insect's direction,and pause equally frequently whether the chase is up or down an incline.

(C) The beetles maintain a fixedtime interval between pauses, although when an insect that had been stationarybegins to flee, the beetle increases its speed after its next pause.

(D) If, when a beetle pauses, ithas not gained on the insect it is pursuing, the beetle generally ends itspursuit.

(E) When an obstacle is suddenlyintroduced just in front of running beetles, the beetles sometimes stopimmediately, but they never respond by running around the barrier.

我选的是A

40. (32869-!-item-!-188;#058&006461)

Columnist:  eople should avoid using a certainartificial fat that has been touted as a resource for those whose medicaladvisers have advised them to reduce their fat intake.  Although the artificial fat, which can beused in place of fat in food preparation, has none of the negative healtheffects of fat, it does have a serious drawback:  it absorbs certain essential vitamins,thereby preventing them from being used by the body.

In evaluating the columnist'sposition, it would be most useful to determine which of the following?

(A) Whether increasing one's intakeof the vitamins can compensate for the effects of the artificial fat

(B) Whether the vitamins that the artificialfat absorbs are present in foods that contain the fat

(C) Whether having an extremely lowfat intake for an extended period can endanger the health

(D) Whether there are any foodsthat cannot be prepared using the artificial fat as a substitute for other fats

(E) Whether people are generallyable to detect differences in taste between foods prepared using the artificialfat and foods that are similar except for the use of other fats

saber0425

Archaeologists in Michigan haveexcavated a Native American camp near Dumaw Creek.  Radiocarbon dating of animal bones found atthe site indicates that the camp dates from some time between 1605 and 1755.  However, the camp probably dates to no laterthan 1630, since no European trade goods were found at the site, and Europeantraders were active in the region from the 1620's onward.

Which of the following, if true,most strengthens the argument?

(A) Due to trade among NativeAmericans, some European trade goods would have reached the area before theEuropean traders themselves did.

(B) At all camps in the region thathave been reliably dated to the late 1620's, remains of European trade goodshave been found.

(C) The first European trade goodsto reach the area would have been considered especially valuable and preservedas much as possible from loss or destruction.

(D) The first European traders inthe area followed soon after the first European explorers.

(E) The site is that of a temporarycamp that would have been used seasonally for a few years and then abandoned.

这道题想要strength的arguement到底是什么？