单项选择题

At the time during year X when the difference between the price of ABC common stock and the price of XYZ common stock was at its greatest, the price of XYZ common stock was approximately what percent of the price of XYZ common stock and ABC common stock combined（）

A. 16%
B. 30%
C. 36%
D. 42%
E. 103%

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单项选择题

In the world of art, distinguishing the authentic piece from the forgery is not an easy feat and often requires the use of multiple experts. Millions of dollars can be at stake, yet even experts can be fooled. However, a recent discovery has introduced a new resource for galleries and other groups seeking to establish the origins of their paintings: mathematicians. Math experts were able to analyze digital images of authenticated paintings where they found consistent differences in paint texture. This consistency suggests that each artist has a unique style of brush stroke that cannot be completely duplicated. In the first two sentences of the passage, the author suggests which of the following （）

A. It is nearly impossible to determine whether a painting is authentic or fake without the use of math.
B. Even if multiple experts from various fields analyze a painting, it is not always possible to determine its authenticity.
C. New discoveries in art always lead to a greater degree of truth.
D. Art can be difficult to analyze, but mathematical models can help to find the truth.
E. Mathematicians have a great degree of expertise in analyzing art.

单项选择题

Eli Whitney’s cotton gin famously changed the face of the agricultural industry by greatly increasing productivity. Although the gin was enormously popular, Whitney himself struggled to make a profit from it. After receiving a patent for his invention, Whitney and his business partner opted to produce as many cotton gins as possible and to charge farmers a user fee instead of selling them outright. Farmers considered this fee unnecessary and exorbitant, and began manufacturing copies of the cotton gin instead. Because of a loophole in the patent law, the many lawsuits brought by Whitney and his partner against the farmers were fruitless. The duo finally agreed to license their cotton gins at a reasonable price. However, due to the costs of their legal battles, they were unable to make the fortune that Whitney had previously predicted. According to the passage, which one of the following was an obstacle in implementing widespread use of Whitneys cotton gin （）

A. Whitney's reluctance to seek a patent for his cotton gin
B. The high fees being charged to farmers for the use of Whitney's cotton gin
C. The negative impact of Whitney's cotton gin on the economy of the south
D. Whitney's inability to profit from his invention
E. Whitney's reliance on a loophole in the patent law