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题目： The primary purpose of the passage is to

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According to the passage, why was aluminum considered a precious metal between 1825 and 1886?

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From the passage, it can be inferred that

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In this passage, the author is primarily concerned with

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题目： $$\frac{3}{8}$$ of all students at Social High are in all three of the following clubs: Albanian, Bardic, and Checkmate. $$\frac{1}{2}$$ of all students are in Albanian, $$\frac{5}{8}$$ are in Bardic, and $$\frac{3}{4}$$ are in Checkmate. If every student is in at least one club, what fraction of the student body is in exactly 2 clubs?

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题目： If r and t are positive integers, what is the value of t?(1) $${t}^{r-1}={1}$$(2) $$r \neq 1$$

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题目： The operation x&n for all positive integers n greater than 1 is defined in the following manner: x&n = x raised to the power of x&(n-1). If x&1 = x, which of the following expressions has the greatest value?

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题目： The passage implies that national policies that rely heavily on economic indicators such as the GDP tend to

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A new study published by the Journal of the American Medical Association has found that women who exercise regularly and maintained a healthy diet are at low risk of sudden cardiac death during physical exertion that is moderate to vigorous in nature.

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Red-light cameras, originally implemented in an attempt at increasing the safety of intersections, have been precisely the opposite: drivers are afraid of expensive citations and often brake suddenly as they approach camera-equipped intersections, so they cause rear-end accidents.

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Although amyotrophic lateral sclerosis, or ALS, typically causes death within 3 to 5 years of the onset of symptoms, on average, the famous physicist Stephen Hawking has defied the odds, in contrast, by living more than 40 years after his initial diagnosis.

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On any city street in today's world one will encounter more women who wear pants than skirts, yet, just two or three generations ago, when police forced actress Marlene Dietrich to leave Paris in 1945, for she had dared to wear pants on the street.

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Human activity on the continent of Antarctica is regulated by the Antarctic Treaty, which was signed in 1959 by 12 countries and prohibits any military activity, supports scientific research, and is giving protection to the continent's ecozone.

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The first woman elected to Congress in the United States, many people regard Jeanette Rankin to be a role model because of her committing to peace, as shown by her legislative votes against joining both World Wars.

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题目： An equal number of desks and bookcases are to be placed along a library wall that is 15 meters long. Each desk is 2 meters long, and each bookshelf is 1.5 meters long. If the maximum possible number of desks and bookcases are to be placed along the wall, then the space along the wall that is left over will be how many meters long?