Reading Comprehension Subject Sentence 2 — Questions and Answers
Question 1: Which of the following sentences best functions as a topic sentence for a paragraph about the benefits of regular exercise?
- I went jogging yesterday morning before work
- Regular exercise provides numerous physical and mental health benefits (Correct answer)
- The gym on Main Street opens at 6 AM
- Some people prefer running to swimming
Correct answer: Regular exercise provides numerous physical and mental health benefits
A topic sentence states the main idea that the rest of the paragraph will develop. This sentence introduces the broad claim (numerous benefits) that supporting details about specific physical and mental benefits would elaborate on.
An effective topic sentence has two qualities: it states the paragraph's main idea and it is broad enough to be developed with supporting details. 'Regular exercise provides numerous physical and mental health benefits' does both — it makes a claim (benefits exist) and signals two categories of evidence to come (physical and mental). Option A is a personal anecdote. Option C is a specific fact. Option D is about preferences, not benefits. Only B sets up a paragraph's worth of supporting evidence.
Question 2: Read the paragraph: '_______________. For example, students who take notes by hand tend to retain information better than those who type. Additionally, breaking study sessions into shorter intervals improves long-term memory. Finally, teaching material to someone else reinforces the learner's own understanding.' Which sentence best fills the blank as a topic sentence?
- Computers are useful tools for students
- Studying is difficult for most people
- Research has identified several effective study strategies that improve learning outcomes (Correct answer)
- Schools should ban laptops from classrooms
Correct answer: Research has identified several effective study strategies that improve learning outcomes
The supporting details present three research-backed study strategies (handwriting notes, spaced practice, teaching others). The topic sentence must introduce the concept of research-based study strategies.
The supporting details are: (1) handwriting notes improves retention, (2) shorter study intervals improve memory, and (3) teaching others reinforces understanding. Each is a research-supported study strategy. The topic sentence must introduce this set. Option C does exactly this — it mentions research, effective strategies, and learning outcomes. Option A mentions computers but only one detail involves typing. Option B is about difficulty, not strategies. Option D makes a policy argument not supported by the details.
Question 3: In the passage 'Coral reefs are sometimes called the rainforests of the sea. They cover less than 1% of the ocean floor but support approximately 25% of all marine species. This incredible biodiversity makes them one of the most ecologically important habitats on Earth,' which sentence is the topic sentence?
- The second sentence about ocean floor coverage
- The first sentence comparing reefs to rainforests (Correct answer)
- The third sentence about ecological importance
- None of the sentences functions as a topic sentence
Correct answer: The first sentence comparing reefs to rainforests
The first sentence introduces the central comparison (reefs are like rainforests) that the subsequent sentences develop by explaining WHY this comparison is apt (biodiversity, ecological importance).
The first sentence sets up the paragraph's framework: comparing coral reefs to rainforests. This comparison (implying richness, biodiversity, importance) is then supported by the second sentence (quantifying the biodiversity) and the third sentence (stating the ecological significance). The first sentence is the topic sentence because it introduces the central idea that the rest of the paragraph develops. The second and third sentences provide evidence and conclusions that support the rainforest comparison.
Question 4: A student writes the following topic sentence: 'My dog Buster is a golden retriever.' Why is this a weak topic sentence for a paragraph?
- It is grammatically incorrect
- It states a simple fact that cannot be developed with supporting arguments or analysis (Correct answer)
- It is too long and complex
- It contains an opinion that cannot be supported
Correct answer: It states a simple fact that cannot be developed with supporting arguments or analysis
A breed identification is a closed fact — there's nothing to argue, analyze, or develop. A strong topic sentence makes a claim that requires elaboration and evidence.
An effective topic sentence should be developable — it makes a claim or introduces an idea that supporting sentences can elaborate on. 'My dog Buster is a golden retriever' is a simple factual statement with nowhere to go. What supporting details would develop this? Compare it to 'My dog Buster demonstrates all the qualities that make golden retrievers ideal family pets' — this invites examples and evidence. The grammar is fine (A), it's not too complex (C), and it's not an unsupportable opinion (D). It's simply too narrow and closed to function as a topic sentence.
Question 5: Where is the topic sentence located in the following paragraph? 'Honeybees perform a waggle dance to indicate the distance and direction of food sources. Scout bees return to the hive and dance in specific patterns that other bees can interpret. The angle of the dance relative to the sun indicates direction, while the duration of the waggle indicates distance. Honeybee communication is remarkably sophisticated for an insect species.'
- First sentence (Correct answer)
- Second sentence
- Third sentence
- Last sentence
Correct answer: First sentence
The first sentence introduces the main idea — bees use a waggle dance to communicate food locations. The following sentences provide details about how this works, and the last sentence offers a concluding observation.
The first sentence introduces the key concept: honeybees use a waggle dance to communicate distance and direction of food. Sentences 2 and 3 elaborate on HOW this works (scout bees dance, angle = direction, duration = distance). The final sentence is a concluding evaluation, not a topic sentence. The paragraph flows from general concept (sentence 1) to specific mechanics (sentences 2-3) to evaluation (sentence 4). This deductive structure places the topic sentence first — the most common pattern.
Question 6: Which revision transforms the weak topic sentence 'There are many types of renewable energy' into a stronger one?
- Solar panels are on many rooftops
- Renewable energy sources like solar, wind, and hydroelectric power offer viable alternatives to fossil fuels that can reduce carbon emissions (Correct answer)
- Energy is important for modern life
- Some people like renewable energy and some do not
Correct answer: Renewable energy sources like solar, wind, and hydroelectric power offer viable alternatives to fossil fuels that can reduce carbon emissions
The revised sentence specifies the types of renewable energy, makes a claim (viable alternatives that reduce emissions), and invites development through examples and evidence for each energy source.
The original sentence ('many types of renewable energy') is vague — what about them? Option B improves it by: (1) naming specific types (solar, wind, hydroelectric), (2) making a debatable claim (viable alternatives to fossil fuels), and (3) adding a significant benefit (reducing carbon emissions). This gives the paragraph clear direction and invites supporting evidence. Option A narrows to one technology. Option C is too vague. Option D introduces a debate format but makes no substantive claim.
Reading Comprehension Subject Sentence 2
Which of the following sentences best functions as a topic sentence for a paragraph about the benefits of regular exercise?