[Sentence Correction]
试题详情
题目：
The English physician Edward Jenner found that if experimental subjects were deliberately infected with cowpox, which caused only a mild illness, they are immune from smallpox.
选项:
答案:
E
问答
3答疑
3答疑
[Sentence Correction]
试题详情
题目：
Elk now live almost solely in the Rocky Mountains, which would make it seem that elk are mountain dwellers, while they once ranged over virtually all of the continental United States except for a small strip in the extreme Southwest.
选项:
A、Elk now live almost solely in the Rocky Mountains, which would make it seem that elk are mountain dwellers, while
B、The fact that elk now live almost solely in the Rocky Mountains would make it seem that they are mountain dwellers, but
C、It would seem that elk would be mountain dwellers because of their living now solely almost in the Rocky Mountains, but still
D、Now living almost solely in the Rocky Mountains, it would seem that elk were mountain dwellers, although
E、It seems that elk would be mountain dwellers from the fact that they now live solely almost in the Rocky Mountains, since
答案:
B
3答疑
[Critical Reasoning]
试题详情
题目：
Though sucking zinc lozenges has been promoted as a treatment for the common cold, research has revealed no consistent effect. Recently, however, a zinc gel applied nasally has been shown to greatly reduce the duration of colds. Since the gel contains zinc in the same form and concentration as the lozenges, the greater effectiveness of the gel must be due to the fact that cold viruses tend to concentrate in the nose, not the mouth.
In order to evaluate the argument, it would be most helpful to determine which of the following?
选项:
A、Whether zinc is effective only against colds, or also has an effect on other virally caused diseases
B、Whether there are remedies that do not contain zinc but that, when taken orally, can reduce the duration of colds
C、Whether people who frequently catch colds have a zinc deficiency
D、Whether either the zinc gel or the lozenges contain ingredients that have an impact on the activity of the zinc
E、Whether the zinc gel has an effect on the severity of cold symptoms, as well as on their duration
答案:
D
3答疑
[Reading Comprehension]
试题详情
文章：
Most farmers attempting to control slugs and snails turn to baited slug poison, or molluscicide, which usually consists of a bran pellet containing either methiocarb or metaldehyde. Both chemicals are neurotoxins that disrupt that part of the brain charged with making the mouth move in a coordinated fashion--the "central pattern generator"--as the slug feeds. Thus, both neurotoxins, while somewhat effective, interfere with the slugs' feeding behavior and limit their ingestion of the poison, increasing the probability that some will stop feeding before receiving a lethal dose. Moreover, slugs are not the only consumers of these poisons: methiocarb may be toxic to a variety of species, including varieties of worms, carabid beetles, and fish.
Researchers are experimenting with an alternative compound based on aluminum, which may solve these problems, but this may well have a limited future as we learn more about the hazards of aluminum in the environment. For example, some researchers suggest that acid rain kills trees by mobilizing aluminum in the soil, while others have noted that the human disease Alzheimer's is more prevalent in areas where levels of aluminum in the soil are high. With farmers losing as much as 20 percent of their crops to slugs and snails even after treatment with currently available molluscicides, there is considerable incentive for researchers to come up with better and environmentally safer solutions.
题目：
The passage suggests that methiocarb and metaldehyde would be more effective as slug poisons if it were true that they
选项:
A、disrupt the slug's digestive processes rather than its reproductive functions
B、reduce the slug's ability to taste food
C、begin to affect the feeding behavior of a slug only after it has ingested a lethal dose
D、reach the central pattern generator more quickly
E、accumulate only in the central pattern generator rather than throughout the brain
答案:
C
3答疑
[Data Sufficiency]
试题详情
题目：
Joanna bought only $0.15 stamps and $0.29 stamps. How many $0.15 stamps did she buy?
(1) She bought $4.40 worth of stamps.
(2) She bought an equal number of $0.15 stamps and $0.29 stamps.
选项:
答案:
A
3答疑
[Sentence Correction]
试题详情
题目：
Three out of every four automobile owners in the United States also own a bicycle.
选项:
A、Three out of every four automobile owners in the United States also own a bicycle.
B、Out of every four, three automobile owners in the United States also owns a bicycle.
C、Bicycles are owned by three out of every four owners of automobiles in the United States.
D、In the United States, three out of every four automobile owners owns bicycles.
E、Out of every four owners of automobiles in the United States, bicycles are also owned by three.
答案:
A
3答疑
[Sentence Correction]
试题详情
题目：
Rather than ignore a company that seems about to fail, investment analysts should recognize that its reorganization and recent uptick in revenue, combined with its dynamic new leadership, indicate that the firm's prospects must be taken seriously.
选项:
A、Rather than ignore a company that seems about to fail,
B、Rather than ignoring a company that is about to seemingly fail,
C、Instead of a company that is seemingly about to fail being ignored,
D、Instead of ignore a company that seems about to fail,
E、In place of ignoring a company's imminent failure seemingly about to occur,
答案:
A
3答疑
[Reading Comprehension]
试题详情
文章：
Citing the fact that the real gross domestic product (GDP) per capita was higher in 1997 than ever before, some journalists have argued that the United States economy performed ideally in 1997. However, the real GDP is almost always higher than ever before; it falls only during recessions. One point these journalists overlooked is that in 1997, as in the twenty-four years immediately preceding it, the real GDP per capita grew nearly one-half percent a year more slowly than it had on aver-age between 1873 and 1973. Were the 1997 economy as robust as claimed, the growth rate of real GDP per capita in 1997 would have surpassed the average growth rate of real GDP percapita between 1873 and 1973 because over fifty percent of the population worked for wages in 1997 whereas only forty percent worked for wages between 1873 and 1973. If the growth rate of labor productivity (output perhour of goods and services) in 1997 had equaled its average growth rate between 1873 and 1973 of more than two percent, then, given the proportionately larger workforce that existed in 1997, real GDP per capita in 1997 would have been higher than it actually was, since output is a major factor in GDP. However, because labor productivity grew by only one percent in 1997, real GDP per capita grew more slowly in 1997 than it had on average between 1873 and 1973.
题目：
According to the passage, which of the following is true of the average rate at which real GDP per capita grew in the twenty-four years immediately before 1997?
选项:
A、It was less than it had been between 1873 and 1973 because only forty percent of the population worked for wages between 1873 and 1973.
B、It was less than it had been between 1873 and 1973 because labor productivity grew less between 1973 and 1997 than it had between 1873 and 1973.
C、It was less than it had been between 1873 and 1973 as a result of an increase in the percentage of the population earning wages during these years.
D、It was less than the average rate at which real GDP per capita grew between 1873 and 1973.
E、It was less than the rate at which real GDP per capita grew in 1997.
答案:
D
3答疑
[Problem Solving]
试题详情
题目：
A certain business produced x rakes each month form November through February and shipped 
rakes at the beginning of each month from March through October. The business paid no storage costs for the rakes from November through February, but it paid storage costs of $0.10 per rake each month from March through October for the rakes that had not been shipped. In terms of x, what was the total storage cost, in dollars, that the business paid for the rakes for the 12 months form November through October?
rakes at the beginning of each month from March through October. The business paid no storage costs for the rakes from November through February, but it paid storage costs of $0.10 per rake each month from March through October for the rakes that had not been shipped. In terms of x, what was the total storage cost, in dollars, that the business paid for the rakes for the 12 months form November through October?选项:
A、0.40x
B、1.20x
C、1.40x
D、1.60x
E、3.20x
答案:
C
3答疑
[Data Sufficiency]
试题详情
题目：
One kilogram of a certain coffee blend consists of x kilogram of type I coffee and y kilogram of type II coffee. The cost of the blend is C dollars per kilogram, where C = 6.5x + 8.5y. Is x
0.8?
0.8?(1) y
0.15
(2) C 0.15
7.30选项:
答案:
B
0评分
564浏览
[Undefined]
Art historian: Unlike many artistic traditions that sought to depict plants native to the local area in a seasonally appropriate way (for example, depicting scenes of spring with the plants in the appropriate stages of development for that season), seventeenth-century Dutch artists specializing in flower paintings almost exclusively chose to depict exotic species of flowers from outside the local area. Painting such species was worthwhile primarily because the art-buying public had developed a strong preference for images of the exotic. The great botanical centers of the time gave the artists direct access to such flowers, which the artists would freely combine in a single painting, regardless of whether the combined species occurred together in the wild, and depicted each in full bloom, regardless of whether those species bloomed at the same time in nature.
Statement: The art historian makes the point that the species of flowers these Dutch artists chose to paint were 1 largely because the species were 2 .
Select for 1 and for 2 the options that complete the statement so that it is most strongly supported by the information provided. Make only two selections, one in each column.
Statement: The art historian makes the point that the species of flowers these Dutch artists chose to paint were 1 largely because the species were 2 .
Select for 1 and for 2 the options that complete the statement so that it is most strongly supported by the information provided. Make only two selections, one in each column.
我选的CE，和EC有什么区别？怎么选出EC的？
0评分
1707浏览
[Undefined]
An unusually severe winter occurred in Europe after the continent was blanketed by a blue haze resulting from the eruption of the Laki Volcano in the European republic of Iceland in the summer of 1984. Thus, it is evident that major eruptions cause the atmosphere to become cooler than it would be otherwise.
Which of the following statements, if true, most seriously weakens the argument above?
C选项为什么就不会有张冠李戴的问题呢，1984和1982的气候情况能一样吗，C里的火山就可以试用于原文的火山吗
0评分
1910浏览
[Undefined]
The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?
为什么这个题一定是相乘不能是相加呢？y=k1A方-k2B （k1,k2大于0 ），也满足题目说的与A方成正比与B成反比啊？但是这道题只有相乘的情况才能选出正确答案
0评分
715浏览
[Undefined]
Tiger beetles are such fast runners that they can capture virtually any nonflying insect. However, when running toward an insect, the beetles intermittently stop, and then, a moment later, resume their attack. Perhaps they cannot maintain their pace and must pause for a moment's rest; but an alternative hypothesis is that while running tiger beetles are unable to process the resulting rapidly changing visual information, and so quickly go blind and stop.
Which of the following, if discovered in experiments using artificially moved prey insects, would support one of the two hypotheses and undermine the other?
答案C是怎么支持一个猜想又削弱另一个猜想的？
0评分
1623浏览
[GWD]
The author of the passage implies that which of the following is a possible partial explanation for acquisition behavior during the 1970's and 1980's?
请解释这道题为什么不选C或E，除了正确选项B，我认为文中也正确地提到了这两个选项可以解释acquisition behavior during 1970s and 80s
0评分
1141浏览
0评分
765浏览
[Undefined]
Club X has more than 10 but fewer than 40 members. Sometimes the members sit at tables with 3 members at one table and 4 members at each of the other tables, and sometimes they sit at tables with 3 members at one table and 5 members at each of the other tables. If they sit at tables with 6 members at each table except one and fewer than 6 members at that one table, how many members will be at the table that has fewer than 6 members?
提问小梅老师 这道题求讲一下 我没什么思路 带入数字得的是3
0评分
780浏览
[Undefined]
A photography dealer ordered 60 Model X cameras to be sold for $250 each, which represents a 20 percent markup over the dealer's initial cost for each camera. Of the cameras ordered, 6 were never sold and were returned to the manufacturer for a refund of 50 percent of the dealer's initial cost. What was the dealer's approximate profit or loss as a percent of the dealer's initial cost for the 60 cameras?
请问小梅老师 这道题讲讲一下 我算的是19% 原来成本是200每个 亏了6个 每个亏100. 最后得不出答案
0评分
180663浏览
0评分
187777浏览
