2. 外语
  3. 　　　　　 The Moon, which has undergone a distinct and complex geological history, presents a 　　　 striking appearance. The moon may

　　　　　 The Moon, which has undergone a distinct and complex geological history, presents a 　　　 striking appearance. The moon may

admin2004-12-30  77
问题 　　　　　 The Moon, which has undergone a distinct and complex geological history, presents a
　　　 striking appearance. The moon may be divided into two major terrains: the maria (dark
　　　 lowlands) and the terrace( bright highlands). The contrast in the reflectivity (the capability
　　　 of reflecting light) of these two terrains suggested to many early observers that the two
(5)　  terrains might have different compositions, and this supposition was confirmed by missions to
　　　 the Moon such as Surveyor and Apollo. One of the most obvious differences
　　　 between the terrains is the smoothness of the maria in contrast to the roughness of the
　　　 highlands. This roughness is mostly caused by the abundance of craters; the highlands are
　　　 completely covered by large craters(greater than 40-50 km in diameter), while the craters
(10)　 of the maria tend to be much smaller. It is now known that the vast majority of the Moon’s
　　　 craters were formed by the impact of solid bodies with the lunar surface.
　　　　　 Most of the near side of the Moon was thoroughly mapped and studied from telescopic
　　　 pictures years before the age of space exploration. Earth-based telescopes can resolve
　　　 objects as small as a few hundred meters on the lunar surface. Close observation of
(15)　 craters, combined with the way the Moon diffusely reflects sunlight, led to the
　　　 understanding that the Moon is covered by a surface layer, or regolith, that overlies the
　　　 solid rock of the Moon. Telescopic images permitted the cataloging of a bewildering array
　　　 of land forms. Craters were studied for clues to their origin; the large circular maria were
(20)　seen. Strange, sinuous features were observed in the maria. Although various land forms
　　　 were catalogued, the majority of astronomers’ attention was fixed on craters and their
　　　 origins.
　　　　　 Astronomers have known for a fairly long time that the shape of craters changes as
　　　 they increase in size. Small craters with diameters of less than 10-15 km have relatively
(25)　simple shapes. They have rim crests that are elevated above the surrounding terrain,
　　　 smooth, bowl-shaped interiors, and depths that are about one-fifth to one-sixth their diameters.
　　　 The complexity of shape increases for larger craters.
选项 A、What astronomers learned from the Surveyor and Apollo space missions
B、Characteristics of the major terrains of the Moon
C、The origin of the Moon’s craters
D、Techniques used to catalogue the Moon’s land forms
答案B
解析
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