SAT语法模拟练习:北方合唱蛙

SAT语法大全(附答案)

　　The Boreal Chorus Frog: An Exceptional Amphibian?

　　Over the past decade, a remarkable number of amphibians have come under the threat of extinction. A study conducted by

　　the International Union for Conservation of Nature showed that 1 in 2011 the percentage of amphibian species identified as

　　threatened was greater than the percentage of all other species combined. If this trend continues, it would mark the largest

　　extinction event since the Pleistocene Era extinctions 10,000 years ago. Several factors contribute to the alarming decline in

　　amphibian 2 species; the destruction of habitat, introduction of invasive species, 3 contaminating the environment, and rise of

　　infectious diseases.

　　One amphibian species, though, remains curiously robust. Named for its distinctive breeding call, 4 other species have been

　　negatively impacted by factors that do not seem to affect the boreal chorus frog. For example, one of the most serious threats

　　to amphibians is chytridiomycosis, a disease caused by the chytrid fungus. 5 Although this fungus is widespread in the United

　　States, boreal chorus frog populations in Colorado have high survival rates and appear to not be seriously affected by the

　　disease. 6 Subsequently, classifying a particular species as robust can be somewhat difficult.

　　[1] Without this longitudinal data, the natural variability in amphibian reproduction and life histories can mask declines.[2] In

　　addition, for many species, only particular age classes or life stages are amenable 7 with census, making it difficult to know the

　　true extent of a species’ population. [3] The biggest challenge to classifying amphibians such as the boreal chorus frog lies in a

　　lack of longitudinal data–data collected over an extended period of time. [4] Thus, the boreal chorus frog may simply be in a

　　short robust period and may prove to be just as susceptible to the threats facing other amphibians. 8

　　What has been made clear from 9 researcher’s data, and what comprises the key issue in studying amphibians, is the

　　aforementioned number of threatened species. Amphibians play important roles in ecosystems, human health, and commerce.

　　They have 10 stuck around for the past 350 million years, surviving many changes that caused other organisms to become

　　extinct. 11 The deterioration of this historically resilient group highlights the importance of the recent studies on threatened

　　amphibians. Ultimately, the boreal chorus frog may prove to be a red herring in a sea of data that points to the need to

　　examine the environmental factors that have caused the current decline in the overall amphibian population.

　　1 Which choice offers an accurate interpretation of the data in the chart?

　　A. NO CHANGE

　　B. in 2011 the number of amphibian species threatened was greater than the number of plant species threatened.

　　C. in 2011 nearly 30 percent of amphibian species were threatened, surpassing the percentage of threatened mammals.

　　D. since 2000 the percentage of threatened amphibian species has surpassed all other groups except mammals.

　　2

　　A. NO CHANGE

　　B. species,

　　C. species

　　D. species:

　　3

　　A. NO CHANGE

　　B. contaminants entering the environment,

　　C. contamination of the environment,

　　D. the environment being contaminated,

　　4

　　A. NO CHANGE

　　B. the boreal chorus frog appears to be largely unaffected by factors that have negatively impacted other amphibian

　　species.

　　C. factors that negatively impact other amphibian species do not appear to affect the boreal chorus frog. D. the negative effects seen in other amphibian species have not been observed in boreal chorus frog populations.

　　5

　　A. NO CHANGE

　　B. Although this fungus is widespread where there are also boreal chorus frog populations

　　C. Although this fungus, the chytrid fungus, is widespread

　　D. Although this fungus can be found in many locations where there are also boreal chorus frog populations

　　6

　　A. NO CHANGE

　　B. Indeed,

　　C. However,

　　D. Furthermore,

　　7

　　A. NO CHANGE

　　B. to

　　C. for

　　D. in

　　8 To make the paragraph most logical, sentence 3 should be placed

　　A. where it is now.

　　B. before sentence 1.

　　C. after sentence 1.

　　D. after sentence 4.

　　9

　　A. NO CHANGE

　　B. researchers’

　　C. researchers’s

　　D. researchers

　　10

　　A. NO CHANGE

　　B. hung in there

　　C. persevered brilliantly

　　D. been a constant presence

　　11 The writer is considering deleting the underlined sentence. Should the writer make this deletion?

　　A. Yes, because the sentence does not focus on the boreal chorus frog.

　　B. Yes, because the sentence restates a point that has already been made in the previous sentence.

　　C. No, because the sentence explains how the fact in the previous sentence relates to the importance of current amphibian

　　studies.

　　D. No, because the sentence contains a specific example of amphibian extinction that is relevant to the topic of the

　　paragraph.

　　CDCBA CBBBD C

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