The Sentence Comparison section of the Reading Comprehension test has several possible answers, covered in more depth here.
Supporting statement sentences do not simply repeat information but provide additional information used to reinforce the other sentence. This may take the form of providing additional facts to support the sentence, providing quotes to support an idea, or providing examples to promote a certain idea.
“Foodborne illness constitutes a significant portion of hospitalizations in the United States. Transmission of these illnesses caused 88% of sufferers to seek hospital treatment, and ended in significant hospitalization.”
In the passage above, the statistics serve as part of the supporting statement, as they illustrate the main idea: that foodborne illness constitutes a problem in the United States.
In contrast to supporting statements, contradicting statement sentences deliver information or ideas that directly defy the other sentence. These may contradict the other sentence in plain English, or may simply offer facts or figures that defy the other sentence.
“Many men and women feel that price is the chief determiner in deciding what type of food to purchase. However, today, many people are opting for healthier choices when grocery shopping.”
The first sentence identifies one mindset, while the following sentence demonstrates another. This is a contradicting statement. Contradicting statements may be identified by the use of but, however, and although in the sentence’s beginning.
Repetitive statements reinforce the initial idea in a similar or repetitive way. This does not mean that the sentences will be identical; rather, it means that the same idea or information will be presented in a unique way, without any additional supporting information.
“Cats and dogs are very different animals. Cats and dogs react to external stimuli in completely different manners, making them almost opposites in terms of temperament and behavior.”
These two sentences say the same thing: cats and dogs are different. However, they are not said outright. Instead, the first is a simple statement, while the second reinforces and expounds upon the first statement.