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Reading Comprehension: Detail Function Questions

The author mentions geyser-like eruptions most probably in order to

Excellent!

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The scientists mentioned in the second paragraph believe in the existence of liquid water on Mars' surface; the author mentions the geyser-like eruptions as a detail in their hypothesis about Mars previous state.

Incorrect.

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Since geyser-like eruptions involve water, their existence cannot support the claim that there is no water on Mars.

Incorrect.

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While it is true that we know of geyser-like eruptions thanks to the spacecrafts exploring Mars, this is not the reason for mentioning them. The way in which this information was obtained is secondary to the conclusion which scientists reached on the basis of this information.

Incorrect.

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According to the passage, this answer choice is incorrect. Geyser-like eruptions might have occurred in Mars in the near past (up to recent years), but this is no longer the case.

Incorrect.

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The ongoing debate is the subject of the fourth paragraph, not the second, so it is unlikely the author used this detail to stress the debate. Furthermore, mentioning geyser-like eruptions in itself does not show the reader that the debate is far from being resolved, so it cannot be used for this purpose.

support the claim that there is currently no liquid water on Mars 
illustrate the type of information collected by spacecrafts exploring Mars 
elaborate on the hypothesis that, in the past, there used to be liquid water on Mars
describe a body of water that characterizes the surface of Mars
show the reader that the debate over the existence of liquid water on Mars is far from being resolved