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first paragraph, the author describes objects in the universe in terms of their
(A) color
(B) origin
(C) location
(D) shape
12. Which of the following is the best representation of the clouds of radio emission described in the first paragraph?
(A) （图）
(B) （图）
(C) （图）
(D) （图）
13. According to the passage, scientists do not fully understand why double radio sources
(A) have not eventually disappeared
(B) cannot be observed with a telescope
(C) are beginning to slow down
(D) are not as big as some planets and stars
14. The word "their" in line 22 refers to
(A) speeds
(B) directions
(C) electrons
(D) clouds
15. According to the passage, what happens when electrons and gas collide in space?
(A) The gas becomes more condensed
(B) The gas becomes less radiated
(C) The electrons disperse
(D) The electrons become negatively charged
16. The author suggests that astronomers consider the study of cosmic jets to be
(A) an obsolete scientific field
(B) an unprofitable venture
(C) an intriguing challenge
(D) a subjective debate
17. In what lines does the passage compare the size of double radio sources with that of other galaxies?
(A) Lines 4-6
(B) Lines 12-14
(C) Lines 19-20
(D) Lines 23-24
18. Where in the passage does the author mention a technology that aided in the understanding of double radio sources?
(A) Line 2
(B) Line 7
(C) Line 17
(D) Line 21
19. The paragraph following the passage most likely discusses
(A) specific double radio sources
(B) an explanation of the synchrotron process
(C) possible reasons for the presence of cosmic jets
(D) the discovery of the first double radio sources.

Questions 20-28
The sculptural legacy that the new United States inherited
from its colonial predecessors was far from a rich one, and
in fact, in 1776 sculpture as an art form was still in the hands
of artisans and craftspeople. Stone carvers engraved their motifs
of skulls and crossbones and other religious icons of death
into the gray slabs that we still see standing today in old burial
grounds. Some skilled craftspeople made intricately carved
wooden ornamentations for furniture or architectural decorations,
while others caved wooden shop signs and ships' figureheads.
Although they often achieved expression and formal excellence
in their generally primitive style, they remained artisans
skilled in the craft of carving and constituted a group distinct
from what we normally think of as "sculptors" in today's
use of the word.

On the rare occasion when a fine piece of sculpture was
desired, Americans turned to foreign sculptors, as in the 1770's
when the cities of New York and Charleston, South Carolina,
commissioned the Englishman Joseph Wilton to make marble
statues of William Pitt. Wilton also made a lead equestrian
image of King George III that was created in New York in
1770 and torn down by zealous patriots six years later. A few
marble memorials with carved busts, urns, or other decorations
were produced in England and brought to the colonies to
be set in the walls of churches-as in King's Chapel in
Boston. But sculpture as a high art, practiced by artists who
knew both the artistic theory of their Renaissance-Baroque-
Rococo predecessors and the various techni本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。