請教各位板友兩題PP CR的問題 PP-1-20 For years the beautiful Renaissance buildings in Palitito have been damaged by exhaust from the many tour buses that come to the city. There has been little parking space, so most buses have idled at the curb during each stop on their tour, and idling produces as much exhaust as driving. The city has now provided parking that accommodates a third of the tour buses, so damage to Palitito's buildings from the buses' exhaust will diminish significantly. Which of the following, if true, most strongly supports the argument? (A) The exhaust from Palitito's few automobiles is not a significant threat to Palitito's buildings. (B) Palitito's Renaissance buildings are not threatened by pollution other than engine exhaust. (C) Tour buses typically spend less than one-quarter of the time they are in Palitito transporting passengers from one site to another. (D) More tourists come to Palitito by tour bus than by any other single means of transportation. (E) Some of the tour buses that are unable to find parking drive around Palitito while their passengers are visiting a site. 答案是C 我選B 雖然後來仔細看 覺得B比較像assumption 不過C不知道該怎麼解釋 Test1-24. (29155-!-item-!-188;#058&003857) Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack. Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop. Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other? (A) When a prey insect is moved directly toward a beetle that has been chasing it, the beetle immediately turns and 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 fixed time interval between pauses, although when an insect that had been stationary begins to flee, the beetle increases its speed after its next pause. (D) If, when a beetle pauses, it has not gained on the insect it is pursuing, the beetle generally ends its pursuit. (E) When an obstacle is suddenly introduced just in front of running beetles, the beetles sometimes stop immediately, but they never respond by running around the barrier. 這題答案是C 只有 B C兩個答案可能是對的 不過感覺B是兩者都支持 而C雖然是答案 可是我看不出來他哪裡有undermine第二個 hypotheses 謝謝~~ --

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