7. GWD28-Q7:

In 1960’s studies of rats, scientists found that crowding increases the number of attacks among the animals significantly.  But in recent experiments in which rhesus monkeys were placed in crowded conditions, although there was an increase in instances of “coping” behavior—such as submissive gestures and avoidance of dominant individuals—attacks did not become any more frequent.  Therefore it is not likely that, for any species of monkey, crowding increases aggression as significantly as was seen in rats.

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

A.    All the observed forms of coping behavior can be found among rhesus monkeys living in uncrowded conditions.

B.    In the studies of rats, nondominant individuals were found to increasingly avoid dominant individuals when the animals were in crowded conditions.

C.    Rhesus monkeys respond with aggression to a wider range of stimuli than any other monkeys do.

D.    Some individual monkeys in the experiment were involved in significantly more attacks than the other monkeys were.

E.     Some of the coping behavior displayed by rhesus monkeys is similar to behavior rhesus monkeys use to bring to an end an attack that has begun.

Which of the following most logically completes the argument?

A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants.  Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert.  Possibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.

A.    histidine is found in all parts of the plant—roots, stem, leaves, and flowers

B.    the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids

C.    others of the closely related group of plants are also found to produce histidine in large quantities

D.    cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic

E.     the concentration of histidine in the growing herb declines as the plant approaches maturity

38: GWD-29-Q35

In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall.  In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.

If the statements above are true, then it is also possible that in Patton
                        City

A.    the number of days with heavy rainfall was lower in 1990 than in 1910

B.    the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910

C.    the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910

D.    the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910

E.     the average amount of rainfall per month was lower in 1990 than in 1910

希望大家给出答案和解释 谢谢了！