Question: Q: Which material used in oxyacetylene torches helps cut and weld metals?    Choices:  - carbon  - sulfur  - dioxide  - acetylene  A:
Answer: acetylene

Question: Q: What is a disease in which the immune system makes an inflammatory response to a harmless antigen?    Choices:  - heartburn  - bronchitis  - cancer  - an allergy  A:
Answer: an allergy

Question: Q: In what type of mining must tunnels be blasted into the rock so that miners and equipment can get to the ore?    Choices:  - open-pit mining  - strip mining  - gold mining  - underground mining  A:
Answer:
underground mining