SECTION IV

Time-35 minutes

24 Questions

Directions: The questions in this section are based on the reasoning contained in brief statements or passages. For some questions, More than one of the choices could conceivably answer the question. However, You are to choose the best answer; that is the response that most accurately and completely answers the questions. You should not make assumptions that are by commonsense standards implausible, superfluous. or incompatible with the passage. After you have chosen the best answer; blacken the corresponding space on your answer sheet.

1. Radioactive waste from nuclear power plants has been temporarily stored on-site, but this is not a satisfactory kind of place for long-range storage. Since no suitable plan of safe permanent storage of such waste from the nation's existing, and planned nuclear plants has been devised, some people propose that we should stop trying to develop such a plan and instead should shut down all present nuclear plants and build no new nuclear plants.

The proposal mentioned above falls short of offering a complete solution to the problem it addresses because

(A) It would prevent the development of safe technologies for the producing electric power.

(B) it does not distinguish between nuclear plants that have, and plants that do not have a reputation for operating safely.

(C) it does not provide for the permanent storage of already existing waste.

(D) the generation of electric power from fossil fuels is relatively safe.

(E) the risks of unsafe disposal of waste from nuclear power plants lie in the future, but the benefits from such plants are in the present.

2. Only 1, 000 to 2, 000 species of fruit flies exist worldwide. Nowhere in the world are fruit flies more taxonomically diverse than in the Hawaiian islands, which host some 500 species, A subset of fruit flies called the picture-winged drosophilids is represented in Hawaii by 106 species. All of the fruit fly species now present in the Hawaiian archipelago are thought to be the descendants of the same one or two ancestral females.

Which one of the following can be inferred from the passage?

(A) All of the picture-winged drosophilids in Hawaii are believed to be the descendants of the same one or two ancestral female fruit flies.

(B) Picture-winged drosophilids are found only in the Hawaiian islands.

(C) All of the 1, 000 to 2, 000 species of fruit flies worldwide are believed to be the descendants of one or two females.

(D) If 500 new species of fruit flies were discovered then Hawaiian fruit flies would no longer be the most taxonomically diverse population.

(E) Some fruit flies originated in Hawaii and spread from there to other parts of the world.

3. In 1860 Bavarian quarry workers discovered the impression of a feather in a limestone slab dating to the Mesozoic era. It had previously been assumed that birds developed only after the close of the Mesozoic era and after the disappearance of pterosaurs, a species characteristic of that era. But there in limestone lay the imprint of a fully aerodynamic, three-inch-long feather. This, therefore, must have been the earliest bird--certainly the earliest found to the date.

The argument assumes which one of the following?

(A) The creature to which the feather belonged was a descendant of the pterosaurs.

(B) Birds with such feathers were preceded by species of birds with less-developed feathers.

(C) In the Mesozoic era, no creatures other than birds had such feathers.

(D) The feather belonged to a Mesozoic creature that was neither a pterosaur nor a bird, but intermediate between them.

共7页: 1 [2] [3] [4] [5] [6] [7] 下一页