p和n是less than 30的正整数，p为质数，n为非质奇数，n+p不可能是?
At a certain company, employees who earn $20.00 per hour will be given an increase of $1.00 per hour. For each of the other employees, either the employee will be given an increase of $1.00 per hour or the employee will be given a percent increase equal to the percent increase that will be given to the employees who earn $20.00 per hour, whichever results in a larger increase for that employee.
Which of the following statements are true?Indicate all such statements.
A. An employee who earns less than $20.00 per hour will be given a percent increase that is greater than the percent increase that will be given to the employees who earn $20.00 per hour.
B. An employee who earns $22.00 per hour will be given an increase of $1.10 per hour.
C. An employee who earns $24.00 per hour will earn $25.20 per hour after the increase.
Among the Meakambut people of Papua New Guinea, legends are associated with specific caves in the Sepik region, and these legends are _____: only the cave owner can share its secrets.
Some novelists immodestly idealized and exaggerated the significance of their work, but others, _____ to exalt the role of the writer, question a transcendent view of the art.
Investors are grateful that the attorney general has stepped in to pursue inquiries into misfeasance in the financial markets, given that the regulators officially charged with policing the industry have been _____.
Even though the authors repeatedly _____ their own shrewdness, they show a remarkable credulousness toward far-fetched ideas such as carbon-eating trees and cloud-making machinery.
The modest but functional new wing finally gives the museum the _____ to serve its visitors properly, including multiple entrances to eliminate the lines that used to snake around the building.
Despite the occasional (i)_____ of their venues, the culture of corporate conferences is a deeply (ii)_____ conference, each day consisted of nearly nine hours of continuous lectures and panels enlivened by pleasantries or anything that could be construed as a joke. The only (iii)_____ sensory deprivation of the sessions came from the handsome color slides favored by the corporate presenters.
Science is arguably a very high-minded pursuit, but that is not to say that all of its practitioners are _____, as numerous articles alleging overly generous pharmaceutical industry payments to medical researchers have tried to show.
With the grand ambition of sending unbreakable coded messages, some physicists are using exotic tools—quantum mechanics and streams of individual photons—to shut out (i)_____. But a wire and a few resistors may (ii)_____ a message as securely, according to a physicist who claims to have devised a simple and uncrackable scheme. The idea shows that more (iii)_____ methods might compete with budding quantum cryptography.
In a sharp blow to his reputation as (i)_____ leader, the evidence that the mayor has recently been involved in malfeasance seems to be (ii)_____.
Early life insurers in the United States found themselves facing the problem of obtaining reliable information, as they needed to rely on applicants themselves to provide truthful, complete answers to a standard set of questions. In an attempt to personalize the relationship between insurers and their individual applicants, firms selected highly respected local citizens to act as their agents. These agents were expected to evaluate the appearance of candidates, unearth evidence of unhealthy family histories or questionable habits, and attest to the respectability of the people writing testimonial letters on an applicant's behalf. In short, the initial purpose of the agency system was not to actively solicit customers, but, rather, to recreate the glass-bowl mentality associated with small towns or city neighborhoods.
The primary purpose of the passage is to
A. explain the original function of life insurance agents
B. evaluate the effectiveness of early life insurance agents
C. describe how life insurance was first introduced
D. illustrate how the life insurance agency system changed over time
E. compare the strategies used by life insurance in cities and in small towns
The author suggests which of the following about “city neighborhoods”?
A. They were places where family histories were difficult to establish.
B. They were places where unhealthy behaviors had been successfully addressed.
C. They were locations that were well suited for recruiting insurance agents.
D. They offered a high degree of transparency about a resident's personal history and character.
E. They offered potentially fruitful markets for the life insurance industry.
Historically, more cold-adapted antelope species originating in Eurasia have migrated into Africa, where the climate is generally warmer, than have warm-adapted African species into Eurasia. A likely explanation for this involves the fact that intercontinental migrations require both a land bridge connecting the two continents and the suitable habitat both on and across that land bridge. During periods of climatic cooling, such as the various ice ages, the land bridge is open for a long time (because sea level remains low) and is usable by cold-adapt species because cool habitats then extend across it. Thus during cooling most migrants would be expected to travel toward Africa, which is near the equator, since this is the direction dictated by habitat changes on a cooling Earth. In contrast, when the Earth is warm, the land bridge is reduced or gone because sea level is relatively high then. Only during the short lag between onset of global temperature change and sea level response can warm-adapted species migrate from the equator toward higher latitudes.
According to the passage, which of the following is true of an Eurasia-Africa land bridge during ice ages?
A. It offers suitable habitats for cold-adapted species of antelope.
B. It encourages migration from Africa to Eurasia of cold-adapted species of antelope.
C. It allows the survival of warm-adapted species of antelope that might otherwise home extinct.
D. It is more likely to exist early in an ice age than later in an ice age.
E. The habitats it offers change more quickly than do those offered by land bridges during other periods.
The author of the passage implies that during the “short lag”, a land bridge between Africa and Eurasia would
A. be inhabited primarily by species of antelope originating in Eurasia
B. be characterized by areas of widely varying elevation above sea level
C. be inhabited by a wide diversity of antelope species
D. contain habitats that could sustain warm-adapt antelope species
E. contain habitats similar to habitats at much higher latitudes in Eurasia
According to the passage, which of the following best accounts for the apparent bias in antelope-migration direction?
A. Warm-adapted antelope species are rarely able to tolerate cool habitats, whereas cold-adapted antelope species usually can tolerate warm habitats.
B. During global warming periods, land bridges, when present, lack habitats suitable for sustaining warm-adapted antelope species.
C. Under most climatic conditions, Africa offers a larger number of suitable antelope habitats than does Eurasia.
D. Many more species of antelope have originated in Eurasia than have originated in Africa.
E. Land bridges are more likely to exist when climate change favors migration to warmer climates than when climate changes favors migration to cooler climates.
As of late 1980s, neither theorists nor large-scale computer climate models could accurately predict whether cloud systems would help or hurt a warming globe. Some studies suggested that a four percent increase in stratocumulus clouds over the ocean could compensate for a doubling in atmospheric carbon dioxide, preventing a potentially disastrous planet-wide temperature increase. On the other hand, an increase in cirrus clouds could increase global warming.
That clouds represented the weakest element in climate models was illustrated by a study of fourteen such models. Comparing climate forecasts for a world with double the current amount of carbon dioxide, researchers found that the models agreed quite well if clouds were not included. But when clouds were incorporated, a wide range of forecasts was produced. With such discrepancies plaguing the models, scientists could not easily predict how quickly the world’s climate would change, nor could they tell which regions would face dustier droughts or deadlier monsoons.
The author of the passage is primarily concerned with
A. confirming a theory
B. supporting a statement
C. presenting new information
D. predicting future discoveries
E. comparing points of view
It can be inferred that one reason the fourteen models described in the passage failed to agree was that
A. they failed to incorporate the most up-to-date information about the effect of clouds on climate
B. they were based on faulty information about factors other than clouds that affect climate
C. they were based on different assumptions about the overall effects of clouds on climate
D. their originators disagreed about the kinds of forecasts the models should provide
E. their originators disagreed about the factors other than clouds that should be included in the models
The information in the passage suggests that scientists would have to answer which of the following questions in order to predict the effect of clouds on the warming of the globe?
A. What kinds of cloud systems will form over the Earth?
B. How can cloud systems be encouraged to form over the ocean?
C. What are the causes of the projected planetwide temperature increase?
D. What proportion of cloud systems are currently composed of cirrus clouds?
Before 1970, children in the United States were commonly vaccinated against smallpox. In the early 1970s, large-scale vaccinations of children against smallpox were discontinued because smallpox had virtually disappeared from the world. Recently, some scientists have cautioned that the Unite States could be exposed to smallpox again. Contrary to what many people believe, this exposure would probably find all age-groups within the United States population at comparable levels of risk of contracting smallpox, since _____.
Which of the following most logically completes the passage?
A. smallpox is a highly communicable disease among people who are not immune to it
B. smallpox vaccine is not now widely available in the United States
C. the population of the United States has been growing more slowly since 1970 than it was before then
D. smallpox vaccinations lose their efficacy after about 20 years
E. people in the United States travel more than they did in 1970, thereby increasing the chances that an epidemic could spread