17. The primary purpose of the passage is to
(A) defend a controversial interpretation of two novels
(B) explain the source of widely recognized responses to two novels
(C) delineate broad differences between two novels
(D) compare and contrast two novels
(E) criticize and evaluate two novels
18. According to the passage, Frankenstein differs from Wuthering Heights in its
(A) use of multiple narrators
(B) method of disguising the author's real purposes
(C) portrayal of men as determiners of the novel's action
(D) creation of a realistic story
(E) controversial effect on readers
19.Which of the following narrative strategies best exemplifies the "evidentiary narrative technique" mentioned in line 24?
(A) Telling a story in such a way that the author's real intentions are discernible only through interpretations of allusions to a world outside that of the story.
(B) Telling a story in such a way that the reader is aware as events unfold of the author's underlying purposes and the ways these purposes conflict with the drama of the plot
(C) Telling a story in a way that both directs attention to the incongruities among the points of view of several characters and hints that the plot has a significance other than that suggested by its mere events
(D) Telling a story as a mystery in which the reader must deduce, from the conflicting evidence presented by several narrators, the moral and philosophical significance of character and event
(E) Telling a story from the author's point of view in a way that implies both the author's and the reader's ironic distance from the dramatic unfolding of events
20. According to the passage, the plots of Wuthering Heights and Frankenstein are notable for their elements of
(A) drama and secrecy
(B) heroism and tension
(C) realism and ambition
(D) mystery and irony
(E) morality and metaphysics
Climatic conditions are delicately adjusted to the composition of the Earth's atmosphere. If there were a change in the atmosphere-for example, in the relative proportions of atmospheric gases-the climate would probably change also. A sight increase in water vapor, for instance, would increase the heat-retaining capacity of the atmosphere and would lead to a rise in global temperatures. In contrast, a large increase in water vapor would increase the thickness and extent of the cloud layer, reducing the amount of solar energy reaching the Earth's surface.
The level of carbon dioxide, CO2, in the atmosphere has an important effect on climatic change. Most of the Earth's incoming energy is short- wavelength radiation, which tends to pass through atmospheric CO2 easily. The Earth, however, reradiates much of the received energy as long-wavelength radiation, which CO2 absorbs and then remits toward the Earth. This phenomenon, known as the greenhouse effect, can result in an increase in the surface temperature of a planet. An extreme example of the effect is shown by Venus, a planet covered by heavy clouds composed mostly of CO2 ,whose surface temperatures have been measured at 430℃. If the CO2 content of the atmosphere is reduced, the temperature falls. Ac- cording to one respectable theory, if the atmospheric CO2 concentration were halved, the Earth would become completely covered with ice. Another equally respectable theory, however, states that a halving of the CO2 concentration would lead only to a reduction in global temperatures of 3℃.
If, because of an increase in forest fires or volcanic activity, the CO2 content of the atmosphere increased, a warmer climate would be produced. Plant growth, which relies on both the warmth and the availability of CO2, would probably increase. As a consequence,