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题库总题数 9689
做题总人数 136870
平均每天做题人数 2326
  • 破解版12 题目总数:203 做题总人数:20679 平均准确率:71.5%

    PREP 12版模考真题,题目难度接近实际考试难度,在考前做PREP模考练习,能帮助你体验考试状态,也是检验备考效果、查漏补缺的一种重要手段,更好的练习做题节奏。

    • 【句子改错SC】-10278 -破解版12

      Many industrial robots perform tasks that are ill-suited either to human hands and eyes or are so onerousor strenuous that people do not want to do them.

      来源: 3349人已做 600难度 93.3%正确率

    • 【句子改错SC】-10276 -破解版12

      Because of the Sun, which is 400 times larger than the Moon, but also 400 times farther away from Earth,so both the Sun and the Moon have the same apparent size in the sky.

      来源: 4475人已做 650难度 58.7%正确率

    • 【句子改错SC】-10275 -破解版12

      Although improved efficiency in converting harvested trees into wood products may reduce harvest rates,it will stimulate demand by increasing supply and lowering prices, thereby boosting consumption.

      来源: 3725人已做 650难度 70.5%正确率

    • 【句子改错SC】-10273 -破解版12

      A study of food resources in the North Pacific between 1989 and 1996 revealed that creatures of the seabed were suffering from dwindling food supplies, possibly resulting from increasing sea surface temperatures during the same period.

      来源:精选题库 3147人已做 600难度 54.3%正确率

    • 【句子改错SC】-10271 -破解版12

      Inhospitable places on our planet, from steaming hot springs to the thick ice of the Polar Regions, tend to be populated by specially adapted microbes flourishing, it seems, in these extreme conditions and are therefore called “extremophiles.”

      来源: 3559人已做 600难度 79.1%正确率

    • 【句子改错SC】-10270 -破解版12

      In July 1965 Mariner IV passed by Mars and took the first-ever close-up photographs of another planet, which showed that the Martian surface was like that of the Moon's in that it was pockmarked by moonlike craters and was dry and apparently dead.

      来源: 2943人已做 600难度 75.5%正确率

    • 【句子改错SC】-10269 -破解版12

      Laboratory rats and mice live up to 40 percent longer than usual when fed a diet of at least 30 percent fewer calories than that which they would normally eat, but that otherwise contains all necessary vitamins and nutrients.

      来源: 7010人已做 600难度 69.2%正确率

    • 【句子改错SC】-10268 -破解版12

      Geologists have found that streams in the Karoo basin of South Africa changed suddenly at the end of the Permian period 250 million years ago, from the meandering shape typically found in well-vegetated zones to the braided pattern found in areas without deep-rooted vegetation to hold the soil together.

      来源: 3058人已做 600难度 79.2%正确率

    • 【句子改错SC】-10267 -破解版12

      Without adequate amounts of sleep, people’s newly acquired skills and also new factual information maynot get properly encoded into their memory circuits.

      来源: 2938人已做 600难度 78.5%正确率

    • 【句子改错SC】-10266 -破解版12

      Unlike amateur clammers, who usually dig clams by hand during the summer, professional clammers work year-round, using all weather instruments such as the hydraulic dredge or a 20-foot-long implement known as a bull rake.

      来源: 3354人已做 650难度 73%正确率

最新讨论题目
  • 【问题求解PS】

    There were 36,000 hardback copies of a certain novel sold before the paperback version was issued. From the time the first paperback copy was sold until the last copy of the novel was sold, 9 times as many paperback copies as hardback copies were sold . If a total of 441,000 copies of the novel were sold in all, how many paperback copies were sold?

  • 【逻辑CR】

    【OG20-P580-669题】Rainwater contains hydrogen of a heavy form called deuterium. The deuterium content of wood reflects the deuterium content  of rainwater available to trees during their growth. Wood from trees that grew between 16,000 and 24,000 years ago in North America contains significantly more deuterium than wood from trees growing today. But water trapped in several North American caves that formed during that same early period contains significantly less deuterium than rainwater in North America contains today.Which of the following, if true, most helps to reconcile the two findings?

  • 【问题求解PS】

    If p is the product of the integers from 1 to 30, inclusive, what is the greatest integer k for which 3k is a factor of p? 

  • 【阅读RC】

    【OG18-P387-455题】According to the passage, each of the following is a difference between women’s oral narratives and most standard histories EXCEPT:

  • 【句子改错SC】

    Such orb-weaving spiders like the argiope build webs in an essentially wheel-like structure, with an outer rim and a number of spokes emanating from the hub.

  • 【逻辑CR】

    【OG20-P607-754题】Vargonia has just introduced a legal requirement that student-teacher ratios in government-funded schools not exceed a certain limit. All Vargonian children are entitled to education, free of charge, in these schools When a recession occurs and average incomes fall, the number of children enrolled in government-funded schools tends to increase. Therefore, though most employment opportunities contract in economic recessions, getting a teaching job in Vargonia's government-funded schools will not be made more difficult by a recession.Which of the following would be most important to in order to evaluate the argument? 

  • 【逻辑CR】

    【OG20-P606-751题】NorthAir charges low fares for its economy-class seats, but it provides very cramped seating and few amenities. Market research shows that economy passengers would willingly pay more for wider seating and better service, and additional revenue provided by these higher ticket prices would more than cover the additional cost of providing these amenities. Even though NorthAir is searching for ways to improve its profitability, it has decided not to make these improvements. Which of the following, if true, would most help to explain NorthAir's decision in light of its objectives?

  • 【逻辑CR】

    【OG20-P602-740题】Studies in restaurants show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presented on a tray that bears a credit card logo. Consumer psychologists hypothesize that simply seeing a credit-card logo makes many credit card holders willing to spend more because it reminds them that their spending power exceeds the cash they have immediately available.Which of the following, if true, most strongly supports the psychologists' interpretation of the studies? 

  • 【逻辑CR】

    【OG20-P602-739题】Between 1980 and 2000 the sea otter population of the Aleutian Islands declined precipitously. There were no signs of disease or malnutrition, so there was probably an increase in the number of otters being eaten by predators. Orcas will eat otters when seals, their normal prey, are unavailable, and the Aleutian Islands seal population declined dramatically in the 1980s. Therefore, orcas were most likely the immediate cause of the otter population decline.Which of the following, if true, most strengthens the argument?

  • 【逻辑CR】

    【OG20-P601-736题】Many people suffer an allergic reaction to certain sulfites, including those that are commonly added to wine as preservatives. However, since there are several winemakers who add sulfites to none of the wines they produce, people who would like to drink wine but are allergic to sulfites can drink wines produced by these winemakers without risking an allergic reaction to sulfites.Which of the following is an assumption on which the argument depends? 

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