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The passage is primarily concerned with

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The author's explanation of how deep events occur would be most weakened if which of the following were discovered to be true?

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Information presented in the passage suggests that, compared with seismic activity at the epicenter of a shallow event, seismic activity at the epicenter of a deep event is characterized by

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The passage supports which of the following Statements about the relationship between the epicenter and the focus of an earthquake?

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The passage suggests that which of the following must take place in order for any earthquake to occur? (1)Stress must build up. (2)Cool rock must descend into the mantle. (3)A fracture must occur

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题目：

The passage is primarily concerned with

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It can be inferred from the passage that if the S waves from an earthquake arrive at a given location long after the P waves, which of the following must be true?

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Which of the following is most clearly an example of the practice referred to in highlight text of the passage?

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The passage states which of the following about the effect of foreign competition on the American manufacturing sector since the 1970's?

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It can be inferred from the passage that which of the following, if true, would be most likely to influence ethologists' opinions about whether a particular gene in a species is a behavioral gene?

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题目： Journalist: the end of the Triassic, the geologic period that extended form about 250 to 200 million years ago, has traditionally been blamed on volcanic eruptions that went on for 600,000 years. However, a researcher has recently suggested that these eruptions were only an indirect cause. By analyzing the isotopic composition of hydrocarbon molecules from plant waxes from the period, he discovered what looks like a spike in the amount of nonbiological carbon in the atmosphere, lasting between 10,000 and 20,000 years. The researcher believes that the release of methane-a carbon-containing greenhouse gas much stronger than carbon dioxide-stored at the bottom of the ocean was the direct cause of the end of the Triassic.The journalist suggests that a certain causal sequence may have brought about the end of the Triassic period. Identify in the table the sequence of cause and effect most strongly suggested by the journalist to have resulted in the end of the Triassic. Make only two selections, one per column.

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题目： For each of the following statements about these indigenous populations, select Yes if the statement accurately reflects the data provided in the table. Otherwise, select No.

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题目： If n and k are positive integers, is n divisible by 6?(1)n = k(k + 1)(k - 1)(2)k - 1 is a multiple of 3.

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The passage provides information about each of the following, EXCEPT

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Which of the following best describes the main purpose of the passage above?