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题目内容
Set D consists of the numbers of the form $$\frac{1}{2^{n}}$$ , where n is an integer from 1 to 10. What is the hundredths digit in the decimal representation of the product of 8,000 and the sum of the numbers in D?
When the positive integer w is divided by 13, the remainder is 1, and when w is divided by 15, the remainder is 14. Which of the following is a possible value for w?
A campaign director can divide the campaign workers into 10 or 11 teams. When the workers are divided into 11 teams, each of 10 of the teams has x workers and 1 team has 6 workers. When the workers are divided into 10 teams, each of 9 of the teams has x+1 workers and 1 team has 5 workers. How many campaign workers are there?
During archery practice, Kyle made 50 attempts to hit a target. After each attempt, his success rate was calculated as the number of successful attempts to hit the target as a percent of the number of attempts up to that time. After the 20th attempt, his success rate was 45 percent. After the 40th attempt, his success rate was 55 percent. Which of the following statements must be true?

Indicate all such statements.
The odds against the occurrence of an event are defined to be the ratio of the probability that the event will not occur to the probability that the event will occur. An integer is to be selected at random from the set of integers from k to n, where k < n. The odds against the event that the integer selected will be an even integer are 1 to 0.95. Which of the following could be the integers k and n, respectively?
The standard deviation of $$n$$ numbers $$x_{1}$$, $$x_{2}$$, $$x_{3}$$,......, $$x_{n}$$, with mean $$\overline{x}$$ is equal to $$\sqrt{\frac{s}{n}}$$, where $$S$$ is the sum of the squared differences $$(x_{i} - \overline{x})^{2}$$ for 1 ≤ i ≤ n.

For what value of $$x$$ is the standard deviation of the numbers $$6$$, $$14$$, $$16$$, and $$x$$ least?
When a certain stock exchange closed on Tuesdays, $$\frac{1}{5}$$ of the stocks closed at the same price as on the previous day. Of the remaining stocks, 3 stocks closed at a higher price for every 4 stocks that closed at a lower price. What fraction of all the stocks on this exchange closed at a higher price than on the previous day?
As a result of a chemical reaction between compounds A and B. $$\frac{1}{4}$$ of each compound was transformed into an equal amount of the other compound, while the remaining $$\frac{3}{4}$$ of each compound was not transformed. If the amount of B was initially 4 times the amount of A, what was the ratio of the amount of A to the amount of B after the reaction?
Suppose a, b, c are different integers, and the repeating decimal $$0.\overline{abc}$$=$$\frac{m}{n}$$, where 0 < m < n < 100 and both m and n are positive integers, then

Quantity A

n

Quantity B

39
If c < b < a < 0, which of the following is equal to |a-b-c|-|b+c|?
All the chairs in a certain cargo have the same weight, and all the tables in the cargo have the same weight. There are 6 times as many chairs as there are tables. The weight of each table is 9 times the weight of each chair. If the total weight of the tables is 1,200 kilograms, then the total combined weight of the chairs and tables is how many kilograms?
For a certain type of can, the number of grams of aluminum per can decreased by 20 percent from 1994 to 1998, while the cost per gram of aluminum decreased by 60 percent. If the cost of the aluminum in $$y$$ cans in 1994 was equal to the cost of aluminum in $$ky$$ cans in 1998, then $$k$$=?
When $$(5n+1)$$ is divided by $$3$$ and $$4$$, the remainder is $$2$$ and $$1$$, respectively.

Quantity A

$$n$$

Quantity B

$$3$$
Many leading photographers have begun to produce work specifically for galleries and museums, and therefore, not surprisingly, they now regard the long-standing question of whether photography really (i)________ art to be (ii)________.
Every few years, as a reviewer, one encounters a novel whose (i)________ are so many in number, and so (ii)_______ that to correct them fully would produce a text that exceeded the novel itself in length. Faced with such a book. one wishes only to let it slip quietly to the seabed of culture, there to join thousands of other (iii)________ books in their slow disintegration
Recently, controversial findings were released that suggest that the amount of carbon dioxide absorbed by United States forests might be greater than the amount emitted by the nation's fossil-fuel combustion. This conclusion has two astonishing implications. First, the United States may not be directly contributing to rising atmospheric levels of carbon dioxide. Second, the atmosphere seems to be benefiting from young forests, which are particularly efficient at absorbing carbon dioxide. But these young forests exist only because old-growth forests were clear-cut in earlier centuries. The possibility that the United States absorbs more carbon dioxide than it produces thus does not reflect efforts to protect the environment; rather, it reflects a history of deforestation and development.
Which of the following, if true, would most weaken the author's argument that the ability of the United States to absorb more carbon dioxide than it produces is not a result of efforts to protect the environment?
It can be inferred from the passage that the author assumes which of the following about United States carbon dioxide emissions?

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