Also in 2025 Practice Test B English, question 52.
Passage The End of an Era
The End of an Era
(1) In 2004, the National Aeronautics and Space Administration (NASA) landed a rover, or robotic vehicle, named Opportunity on the surface of Mars. (2) The rover’s mission was to search for evidence of water and life on the planet. (3) The rover was designed to gather data on Mars for about 90 days, but Opportunity’s assignment did not come to an end until nearly 15 years later in 2019.
(4) During the rover’s mission, a high-resolution camera on the rover’s robotic arm took magnified photographs of the surface of Mars. (5) The photographs revealed small round rocks scattered across the surface of the planet. (6) The scientists nicknamed these rocks “blueberries” based on the rocks’ resemblance to the fruit. (7) These rocks were important because their spherical shape suggested that liquid water may have flowed over them for a substantial amount of time.
(8) Opportunity continued to provide valuable data about craters and other surface features. (9) Throughout the mission, the rover traveled a total of 28.06 miles across Mars’ surface. (10) When Opportunity had traveled nearly the length of a marathon, scientists celebrated the accomplishment by naming the valley that the rover was in Marathon Valley. (11) However, in 2018, a dust storm spread all over the planet, putting the rover’s progress on hold.
(12) Prior to this planet-wide dust storm, minor dust storms had periodically deposited a layer of dust onto the solar panels of the rover. (13) These prevented it from charging its batteries. (14) Scientists then had to rely on the passing winds and dust devils to clean off the solar panels. (15) After the massive 2018 dust storm subsided, scientists expected to be able to reestablish communication with Opportunity. (16) They made repeated attempts but to no avail. (17) In 2019, NASA finally declared Opportunity’s mission complete.
(18) Opportunity was an important asset in scientists’ study of Mars; it returned valuable data about our neighbor planet and survived powerful dust storms. (19) NASA described the mission of Opportunity as “one of the most successful and enduring feats of interplanetary exploration.” (20) Even though this rover’s journey ended, other rovers still roam the surface of Mars.
Question
Read this sentence.
One of Opportunity’s major contributions was finding possible evidence of the presence of water on Mars.
Where should the sentence be added to the passage?
- Abetween sentences 2 and 3
- Bat the beginning of the second paragraph (before sentence 4)
- Cat the end of the second paragraph (after sentence 7)
- Dbetween sentences 8 and 9
Show the answer
Correct answer: B
The question asks where the sentence should be added to the passage.
A. Incorrect. While sentence 2 refers to Opportunity’s mission to search for evidence of water, sentence 3 mentions the rover lasting much longer than anticipated. Placing the sentence between these two ideas, rather than at the start of the second paragraph, where it introduces the topic of the paragraph, would create a disjointed and confusing experience for the reader.
B. CORRECT. The sentence introduces the idea of finding possible evidence of water on Mars, which is the main topic of the second paragraph.
C. Incorrect. The sentence sets up the main idea of paragraph 2, which is the possibility of water on Mars. As a concluding sentence, it would be repetitive and confusing.
D. Incorrect. The sentence introduces the possibility of water on Mars, while sentences 8 and 9 discuss other surface features and the distance traveled by the rover. Adding the sentence here would create a disorganized paragraph.
Question analysis
This organization question gives a new sentence about Opportunity's possible discovery of evidence of water on Mars and asks where it should be added to the rover passage. Students must follow the order of ideas across the first three paragraphs, because the sentence echoes ideas that appear in several places and could seem to fit more than one of them.
- NYS standards
- 7W2a introducing and organizing a topic
- Grade level
- Grade 7 reading and task
- Compared with grade 7
- At grade 7 Deciding where a sentence belongs is typical grade 7 revision work. The four positions span three paragraphs of a plain passage, and the sentence's wording connects to more than one of them, so the order of ideas must be checked.
- Estimated difficulty
- Moderate: several steps, or a close reading with one strong distractor.
- Thinking it demands
- Depth of knowledge 2, skills and concepts · mainly analyze
- What makes it hard
- How sentences fit together moderate
- A very close wrong answer moderate
- Evidence
- Answered from several paragraphs or stanzas
- Reading level
- Passage: about grade 11, 337 words; question and choices: about grade 7, 52 words.
- Students, last 30 days
- Not enough answers yet to show (it takes 10).
Why it is hard, traps and wrong answers (shows the answer)
Why it is hard
The new sentence reads well in more than one place, because water comes up in sentence 2, in sentence 7 and near the “valuable data” of sentence 8. Its wording settles the matter: “One of Opportunity’s major contributions” announces a topic, so it belongs ahead of the evidence. The strongest pull places it as a closing line after sentence 7, where it restates the point the blueberries have just made.
How sentences fit together moderate Working it out
The new sentence names a contribution in general terms, so it belongs before sentence 4, where the camera and the “blueberries” supply the details, not after them. (Halliday & Hasan, 1976)
A very close wrong answer moderate Choosing the answer
The two positions in paragraph 2, before sentence 4 and after sentence 7, both keep the sentence beside the water evidence; they differ only in whether it introduces the details or sums them up. (Embretson & Wetzel, 1987; Gorin & Embretson, 2006; Ascalon et al., 2007)
Strategy: Find what the new sentence is about and where the passage discusses that, then read the sentence in each offered position and check whether it introduces, interrupts or repeats the ideas around it.
Traps
- Sentence in the wrong place: Puts a sentence where it breaks the order of ideas or separates it from what it refers to.
- Says it twice: Repeats an idea that the sentence or passage already states.
The wrong answers, classified
A Sentence in the wrong place (Halliday & Hasan, 1976)
Matches the sentence to sentence 2’s search for water, but there it announces the finding before the photographs are described and cuts into the account of the mission’s length.
C Says it twice (Connors & Lunsford, 1988)
Uses it as a wrap-up after the blueberries, a common paragraph shape, but there it only repeats sentence 7’s point about water instead of introducing the paragraph’s topic.
D Sentence in the wrong place (Halliday & Hasan, 1976)
Links “major contributions” to the “valuable data” of sentence 8, though paragraph 3 covers craters, distance traveled and the dust storm, not water.
Working it out, step by step
Figure out what the question asks
This question asks where a new sentence belongs. First find what the sentence is about. Then find where the passage talks about that. Last, decide whether the sentence should start that part, interrupt it or end it.
Read the new sentence
It says that one of Opportunity’s major contributions was “finding possible evidence of the presence of water on Mars.” It names a big idea in general terms. A sentence like that is a topic sentence. A topic sentence tells what a paragraph will be about. It usually comes first. For example, Dogs help people in many ways. comes before the details about guiding, herding and comforting.
Find where water comes up
Paragraph 2 (sentences 4–7) gives the details. The camera took close-up photos. They showed small round rocks, nicknamed “blueberries.” Sentence 7 says the rocks’ round shape “suggested that liquid water may have flowed over them.” So the new sentence should come right before these details, at the start of paragraph 2.
Check each choice
- A is wrong. Between sentences 2 and 3, it would announce the finding before the photos are described. It would also break up the facts about the mission’s length.
- B is right. Before sentence 4, it introduces the paragraph about the round rocks and water.
- C is wrong. After sentence 7, it would only repeat the point sentence 7 just made.
- D is wrong. Paragraph 3 is about craters, miles and the dust storm, not water.
Watch out: C is tempting because some paragraphs end with a summary. But sentence 7 already makes the point about water.
Choose the answer
So the answer is B: “at the beginning of the second paragraph (before sentence 4).”
Why this answer and not the closest wrong one
C is the closest wrong answer, because it keeps the sentence in the paragraph about water. But the sentence names a topic, so it works best before the details. After sentence 7, it would repeat what the blueberries just showed. Before sentence 4, it tells readers what is coming.
More questions like this
The original DOE question
The passage “The End of an Era” as printed (page 60)
