题目内容
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Why does the professor mention Charles Darwin？
A．To show that Malthus wasn"t taken as seriously as Darwin.
B．To illustrate the difference between two well-respected theorists.
C．To explain how Malthus" work inspired another important theory.
D．To introduce a political economist from another century.
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更多“Why does the professor mention Charles Darwin？A．To show that Malthus wasn"t taken as serio”相关的问题
A、○To present a common opinion held by many scholars
B、○To suggest a similarity between two opinions held by scholars
C、○To suggest a possible explanation for a weakness in an opinion expressed in the passage
D、○To give evidence that contradicts a major opinion expressed in the passage
A、reinforcement.
B、conditioned stimulation
C、unconditioned stimulation
D、indifferentce stimulation
E、conditioned stimulation and indifferent stimulation.
A、growth of new synapses
B、growth of new myelin
C、GABA
D、growth of new astrocytes
A、Because the job is not well-paid.
B、Because she cannot put up with Miranda‘s ill temper any more.
C、Because she decides to listen to her inner voice and pursue her dream.
D、Because she annot meet Miranda's requirement.
the benefits I have mentioned, doing exercises regularly may help to improve one’s self image.
B．To explain the cause of her initial confusion
C．To point out that she has not received e-mails from all her students yet
D．To indicate that she has several students doing projects about restaurants
A．be blended with an ethical doctrine about the best way of living
B．be separated from an ethical doctrine about the best way of living
C．be influenced by an ethical doctrine about the best way of living
D．consist of an ethical doctrine about the best way of living
A．children
B．Americans
C．books
D．vehicles
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.
What does the passage mainly discuss?
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
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