Answer: [Sentence A]
Question: [One of the following sentences is nonsensical. Which one is it?
Options:
- Sentence A: "we listened carefully to what the teacher was thinking"
- Sentence B: "we listened carefully to what the teacher was saying"
]
Solution: [You aren't able to listen to what someone is thinking.]

Answer: [Sentence A]
Question: [Choose the sentence that goes against common sense.
Options:
- Sentence A: "The main greenhouse gas is oxygen"
- Sentence B: "The main greenhouse gas is carbon dioxide"
]
Solution: [The major atmospheric constituents, nitrogen (N 2), oxygen (O 2), and argon (Ar), are not greenhouse gases because molecules containing two atoms of the same element such as N 2 and O 2 have no net change in the distribution of their electrical charges when they vibrate, and monatomic gases such as Ar do not have vibrational modes, hence they are almost totally unaffected by infrared radiation.]

Answer: [Sentence B]

Question: [Of the below sentences, which one does *not* make sense?
Options:
- Sentence A: "Boiling water is hot."
- Sentence B: "Boiling water is cold."
]
Solution: [If water is boiling it must be hot.]