SAT语法模拟练习:穿衣服的狼

SAT语法大全(附答案)

　　A Wolf in Coyote’s Clothing

　　It’s nighttime. All is still. Suddenly, the mournful howl of a coyote drifts through the crisp night air. This isn’t the New

　　Mexico desert or the 1 plains of Wyoming. This is downtown Chicago, New York City’s Central Park, or suburban

　　Connecticut. Over the past several decades, coyotes have been moving steadily eastward and showing up

　　in 2 unexpected places. But that’s not all that’s strange about these eastern coyotes: They’re also bigger than their

　　western cousins. They live in groups and hunt in packs, 3 whereas Western coyotes are solitary and hunt alone. The

　　differences piqued scientists’ curiosity.

　　4 Now, recent genetic studies have confirmed what many experts had suspected. The eastern “coyotes” are actually

　　“coy-wolves”—that is, coyote-wolf hybrids. Different eastern coyote populations have different exact

　　genetic 5 compositions, which scientists have described the average eastern coyote as being a combination of three

　　different species in the genus Canis. Specifically, the animals are mostly coyote, with a sizable wolf contribution, and

　　a little bit of domestic dog thrown in for good measure. These three species can produce viable, fertile offspring

　　because they all have 39 pairs of chromosomes. 6 Most animals prefer to mate within their own species but

　　sometimes, where there are small populations and few choices of mates, hybridization can occur. When it does, the

　　offspring 7 resembles something in between their two parent species. The animals will have a new set of traits. In

　　many cases, these traits 8 will often turn out to be neutral or even negative.

　　In the case of the eastern coyote, however, it seems that the genetic contribution from wolves has actually been the

　　key to the animals’ success and expansion. 9 In the second half of the twentieth century, more of the population

　　moved to cities and suburbs, and fewer acres have been needed for agriculture. Consequently, much of the land has

　　been slowly reverting to forest.

　　With ample habitat and no 10 predators, species such as the white-tailed deer have populated the eastern U.S. in unprecedented numbers. Western coyotes—small and solitary hunters—are no match for even injured or young

　　deer. 11 Hunting in packs by the larger eastern coyotes, the oversaturated deer population can be seriously

　　impacted. Evolution is a process continuing all around us, and it doesn’t always take millions and millions of years.

　　As genetic tools get more sophisticated, sometimes we can even catch it in action.

　　1

　　A. NO CHANGE

　　B. plains’ of Wyoming.

　　C. plain’s of Wyoming.

　　D. Wyoming plains’.

　　2

　　A. NO CHANGE

　　B. out of the blue locations.

　　C. totally random hangouts.

　　D. wondrous positions.

　　3 The writer is considering deleting the underlined portion and ending the sentence with a period. Should the writer

　　make this revision?

　　A. No, because the information provides additional detail about visual differences between eastern and western

　　coyotes.

　　B. No, because the information completes the contrast between the behavior of the eastern and western coyotes.

　　C. Yes, because the information provides irrelevant detail about western coyotes while the author is discussing

　　eastern coyotes.

　　D. Yes, because the information refutes what the author has already said about coyote traits.

　　4 Which choice most effectively establishes the main topic of the paragraph? A. The eastern coyotes are actually coyote-wolf hybrids.

　　B. Wolves and coyotes interbreed in places where they share a habitat and population numbers are low.

　　C. Eastern coyotes are skillful hunters that have managed to take down larger prey animals than wolves.

　　D. The genus Canis is composed of dog-like animals from all over the world - wolves, dogs, dingoes, and jackals.

　　5

　　A. NO CHANGE

　　B. compositions that

　　C. compositions then

　　D. compositions, but

　　6 At this point, the writer wants to illustrate the concept introduced in the preceding sentence by using another

　　species as an example. Which choice best accomplishes this goal?

　　A. Moreover, wolves and coyotes share the same breeding season and habits.

　　B. In contrast, when horses and donkeys interbreed, they produce mules, which are sterile due to their odd number

　　of chromosomes.

　　C. However, higher numbers of chromosomes do not correspond with more sophisticated organisms; humans only

　　have 23 pairs of chromosomes.

　　D. In theory, jackals can interbreed with wolves and coyotes, but they do not live in North America.

　　7

　　A. NO CHANGE

　　B. resembled

　　C. resemble

　　D. has resembled

　　8

　　A. NO CHANGE

　　B. oftentimes will result as traits that are C. will turn out to be

　　D. will turn out as resulting traits that are

　　9 At this point, the writer wants to give historical context for changes in the environment. Which choice best

　　accomplishes that goal?

　　A. Settlers had wiped out large predators like wolves and mountain lions in the eastern portion of the United States

　　by the beginning of the nineteenth century, leaving the ecosystem without an apex predator.

　　B. Wolves, with their larger size and adaptation to colder environments, are more effective predators in northern

　　latitudes than coyotes.

　　C. Some other hybrid animals, like the offspring of tigers and lions, tend to take after one parent much more than

　　the other, usually the mother.

　　D. The coyote population in western states has stayed steady over the twentieth century, while the wolf population

　　in the northern United States and Canada has dwindled.

　　10

　　A. NO CHANGE

　　B. predators species, such as

　　C. predators, species, such as

　　D. predators species such as

　　11

　　A. NO CHANGE

　　B. Hunting in packs, the larger eastern coyotes can have a serious impact on the oversaturated deer population.

　　C. Hunting in packs, a serious impact can be had on the oversaturated deer population by the larger eastern

　　coyotes.

　　D. The oversaturated deer population, by the larger eastern coyotes being hunted in packs, can be seriously

　　impacted.

　　AABAD BCCAA B

SAT水平能力测试【0元免费测试】