Question

Based on the information in the passage, what is true of gases?

A. Some, but not all, gases are harmful to humans.
B. Any gas with carbon in it is not harmful to humans.
C. All gases are harmful to humans.
D. No gases are harmful to humans.

Answer 1

The answer is A because some gases are dangerous and some aren’t

Answer 2

Answer: A. Some, but not all, gases are harmful to humans.

Explanation: Some toxic gases:

• carbon monoxide
• chlorine
• nitrogen dioxide

Harmless gases:

• compressed air
• nitrogen
• helium