20. (28411-!-item-!-188;#058&003617)
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.正选
(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.
29. (31650-!-item-!-188;#058&004636)
To reduce the danger to life and property posed by
major earthquakes, scientists have been investigating several techniques for
giving advance warning of dangerous earthquakes. Since catfish swim erratically before
earthquakes, some investigators have proposed monitoring catfish to predict
dangerous earthquakes.
Which of the following, if true, most seriously
undermines the usefulness of the proposal?
(A) In Japan, which is subject to frequent earthquakes,
the behavior of catfish has long been associated with earthquakes.如果这是support题的话，A算支持吗
(B) Mechanical methods for detecting earthquakes
have not proved effective.
(C) Tremors lead to the release of hydrogen
sulfide gas into water, thereby causing various fish and shellfish to behave
erratically.
(D) Careful construction can reduce the dangers
posed by earthquakes.
(E) Even very slight, fleeting tremors cause
catfish to swim erratically.正选
9. (24749-!-item-!-188;#058&001426)
Scientists are discussing ways to remove excess
carbon dioxide from the atmosphere by increasing the amount that is absorbed by
plant life. One plan to accomplish this
is to establish giant floating seaweed farms in the oceans. When the seaweed plants die, they will be
disposed of by being burned for fuel.
Which of the following, if true, would indicate
the most serious weakness in the plan above?
(A) Some areas of ocean in the Southern Hemisphere
do not contain sufficient nutrients to support large seaweed farms.
(B) When a seaweed plant is burned, it releases an
amount of carbon dioxide comparable to the amount it has absorbed in its
lifetime.正选
(C) Even if seaweed farms prove effective, some
people will be reluctant to switch to this new fuel.
(D) Each year about seven billion tons of carbon
dioxide are released into the atmosphere but only about five billion tons are
absorbed by plant life.
(E) Seaweed farms would make more money by farming
seaweed to sell as nutritional supplements than by farming seaweed to sell as
fuel.
好像有相当一部分加强题的答案都是例子，这也是我做题时慢慢发现的，OG和prep上都有体现，所以现在做加强题的时候看到例子都特别留意一下。
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