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Admission Tests GRE 考試大綱主題:

最新的 Graduate Record Examinations GRE 免費考試真題：

1. Instances of "galactic cannibalism"-mergers in which large galaxies completely consume smaller ones-may be fairly common. Tidal forces produced by the Milky Way's powerful gravity, for example, appear to be dismantling and engulfing a dwarf galaxy in the constellation Sagittarius, producing large clumps and streamers of stars connecting the two galaxies. Astronomers have also observed two dense clusters of stars and gas at the heart of the Andromeda galaxy, an apparent "double nucleus" that may contain the remnant of a cannibalized dwarf galaxy. But this twin-lobed appearance could also be created by two parts of a single nucleus bisected by a lane of dust. Scientists believe that only about 25 percent of such apparent double nuclei actually represent galactic cannibalism. Many of the rest result from the illusion of proximity that occurs when objects at different distances appear along the same line of sight: others consist of debris from galactic
"collisions." in which one galaxy has passed through another without merging, causing waves of new star formation.
The primary purpose of the passage is to

A) indicate the difficulty of determining whether galactic cannibalism has occurred in a given instance
B) present evidence that galactic cannibalism has occurred in a given instance
C) suggest that galactic cannibalism occurs more commonly than previously supposed
D) outline the process by which galactic cannibalism takes place
E) demonstrate flaws in the evidence used to prove that galactic cannibalism actually occurs

2. Recent research has questioned the long-standing view of pearly mussels as exclusively suspension feeders (animals that strain suspended particles from water) that subsist on phytoplankton (mostly algae). Early studies of mussel feeding were based on analyses of gut contents, a method that has three weaknesses. First, material in mucus-bound gut contents is difficult to identify and quantify. Second, material found in the gut may pass undigested out of the mussel, not contributing to its nutrition. Finally, examination of gut contents offers limited insight into the mechanisms and behaviors by which mussels acquire food. Modem studies suggest that pearly mussels feed on more than just algae and may use other means than suspension feeding. Pedal feeding (sweeping up edible material with a muscular structure called the foot) has been observed in juvenile pearly mussels.
Besides the phytoplankton pearly mussels capture from the water column, their guts also contain small animals, protozoans, and detritus (nonliving particulate organic material). Recent studies show that mussels can capture and assimilate bacteria as well, a potentially important source of food in many fresh waters.
Another potential source of food for mussels is dissolved organic matter. Early studies showing that pearly mussels could take up simple organic compounds were largely discounted because such labile (unstable) compounds are rarely abundant in nature. Nevertheless, recent work on other bivalves suggests that dissolved organic matter may be a significant source of nutrition.
Of this complex mix of materials that pearly mussels acquire, what is actually required and assimilated?
Stable-isotope analyses of mussels taken from nature and of captive-reared mussels are beginning to offer some insight into this question. Nichols and Garling showed that pearly mussels in a small river were omnivorous, subsisting mainly on particles less than 2S micrometers in diameter, including algae, detritus, and bacteria. Bacterially derived carbon was apparently the primary source of soft-tissue carbon. However, bacteria alone cannot support mussel growth, because they lack the necessary long-chain fatty acids and sterols and are deficient in some amino acids. Bacteria may supplement other food resources, provide growth factors, or be the primary food In habitats such as headwater streams, where phytoplankton is scarce. Juvenile mussels have been most successfully reared m the laboratory on diets containing algae high in polyunsaturated fatty acids. Thus, it appears that the pearly mussel diet in nature may consist of algae, bacteria, detritus, and small animals and that at least some algae and bacteria may be required as a source of essential biochemicals.
The passage mentions which of the following as a factor that limits the information researchers can glean from analyzing gut contents?

A) Mussels may ingest material that is not essential to their nutrition.
B) Mussels appear to feed on more than one kind of food.
C) The mechanisms mussels use to acquire food are not well understood.
D) Captive-reared mussels ingest substances that wild mussels do not eat.
E) Juvenile mussels are able to acquire edible material through pedal feeding.

3. While prudence is recognized as a kind of virtue, there is nonetheless a tendency to view someone who is prudent as. in some sense._________. too narrow and dull to partake of spontaneously arising opportunities.

A) deficient
B) laudable
C) exemplary
D) inculpable
E) wanting
F) timid

4.

A) The two quantities are equal.
B) Quantity A is greater.
C) Quantity B is greater.
D) The relationship cannot be determined from the information given.

5. Since it was committed to the idea of science as an international, politically neutral enterprise, the Royal Society of London refused to_________members from enemy nations during the world wars of the twentieth century.

A) oust
B) sanction
C) endorse
D) condemn
E) expel
F) betray

問題與答案：