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Some studies have shown that red-backed salamanders (RBS) are scarce in areas with acidic soils and that those present in such conditions have smaller-than-average bodies. Explanations have included the possibility that young RBS are adversely affected by acidic soil, that adult RBS can sense and may avoid acidic soil conditions, or that loss of RBS prey
populations due to acidic soil could result in reduced RBS populations. Yet researchers found fairly high densities of large- bodied RBS at Lake Claire Watershed, where soil conditions are acidic. One hypothesis is that intraspecific geographical variation in acidity tolerance (i.e., local adaptation to an acidic environment) could exist for RBS. Previous studies showed potential local adaptation of some salamander species to acidity.
当前版本由371524c更新于2020-04-22 15:47:02 感谢由371524c对此题目的解答所做出的贡献。
E错，more persuasive 无中生有。
[填空 ]真题1300题 -9219
Climate change is posited to be a frequent factor in mass extinctions by some scientist who speculate that minor climate shifts can trigger a catastrophic cascade of effects. Although this pattern is (i)_____ in that it confirms warnings about our own possibly dire future, it is also somehow (ii)_____ as it sets forth a context for today’s turbulent weather as (iii)_____ in a natural,cyclical process.
[填空 ]真题1300题 -9218
The title of Lee’s 1964 textbook, A History of For Eastern Art, might seem to imply that the entire subject could be encapsulated in a single work. In fact, the treatment of art across Asian cultures and over millennia could never (i)_____ if it also aspired to be (ii)_____.
[填空 ]真题1300题 -9217
Readers had little reason to (i)_____ what proved to be the rather uncanny (ii)_____ of Kaja Silverman’s and bell hooks’s polemics, given the two authors’ contrary methodologies, interests, and audiences.
[填空 ]真题1300题 -9216
Dr. Jack Kevorkian became a subject of controversy in the 1990s by assisting terminally ill people to commit suicide in contravention of Michigan statutes’ _____ such actions.
[填空 ]真题1300题 -9215
In recent years, the country's farmers have been extremely _____ contributing a major portion of the disturbances and protests against government policies.
[填空 ]真题1300题 -9214
Nicolaus Copernicus was much less _____ than commonly thought: he wanted to improve the cosmological theory of his day by introducing one important change while preserving as many of its conceptual foundations as possible.
[填空 ]真题1300题 -9213
Wheelan proceeds from the assumption that statistics are _____ and, consequently, can be taught with minimal intimidation through examples.
[填空 ]真题1300题 -9212
On stage, jazz artist James Carter often veers dangerously close to the _____: he becomes a man possessed, his tenor saxophone wailing and whimpering with a musicality so muscular it threatens to consume him.
[填空 ]真题1300题 -9211
The economist noted that the occupations she analyzed in her study, which included waitresses,flight attendants, clerical workers, and domestic workers, _____ categorization: none can be captured by a single distinguishing characteristic.
[填空 ]真题1300题 -9210
The general statement that all objects are (i)_____ by gravity (ii)_____ is not (iii)_____. In reality,if a feather and a lump of iron were dropped at the same time from the same place, we should not expect them to hit the floor at the same time. In order to reconcile the general statement with real-world phenomena, we must take into consideration all of the forces that act upon objects.
[填空 ]真题1300题 -9209
While catalogs of record labels that specialize in Native American music are useful indices of Native American consumers' preferences, their (i)_____ are also (ii)_____: some genres of Native American music have been deemed inappropriate to record because of their special cultural significance.
[填空 ]真题1300题 -9208
Although Kito Hiroshi's portrait of Edo Japan as (i)_____ is certainly (ii)_____ the fundamental factors of population stability and resource renewal generally did favor social maintenance and even economic growth.
[填空 ]真题1300题 -9207
It is possible that the earliest terrestrial plants were (i)_____ natural enemies, such as herbivores. By the mid-Carboniferous period, however, there was abundant evidence-in the form of fossil leaves with signs of bite marks—that plants were (ii)_____ animal attack.
[填空 ]真题1300题 -9206
Saturn's rings seem _____, but it now appears that several decades ago, the shape of the innermost rings was altered by a mysterious event that all our telescopes and spacecraft failed to detect.
[填空 ]真题1300题 -9205
While Zora Neale Hurston never avowed an affiliation with surrealism, an artistic movement celebrating the unconscious mind's creative power, French surrealist Guy Ducomet’s citing her as an inspiration seems quite _____ given Hurston's intensely imaginative work.
[填空 ]真题1300题 -9204
Building the first United States transcontinental phone line required fundamental innovations: for example, engineers created an amplifier for the electric signals to prevent them from ______ after a few miles.
[填空 ]真题1300题 -9203
An academic with a questionable record in either teaching, administration, or research may still be well regarded at many schools, but simultaneous failure in all three areas normally results in _____ by superiors.
[填空 ]真题1300题 -9202
Enlightened thinkers in late-eighteenth-century Europe broadly endorsed the concept of progress, yet theories of progress were usually _____ a strong streak of pessimism, a sense of the challenges inherent in the human condition.
[填空 ]真题1300题 -9201
Although streams of solar particles cause beautiful auroras —the northern and southern lights—sometimes their consequences are less _____: their electromagnetic effects, for instance, can overload power grids and damage orbiting satellites.
[填空 ]真题1300题 -9200
Some chemists argue that although molecular motors are (i)_____, they are (ii)_____ by themselves; nevertheless, the chemical principles behind them might be (iii)_____: using the same light-activated mechanism that drives certain molecular motors, researchers have developed around 100 drug-like compound that can be switched on or off in response to light.