What does the passage mainly discuss

A:The equipment divers use. B:The effects of pressure on gases in the human body. C:How to prepare for a deep dive. D:The symptoms of nitrogen bubbles in the bloodstream.

What does the passage mainly discuss

A:The detail seen through a microscope. B:Sources of illumination for microscopes. C:A new kind of microscope. D:Outdated microscopic techniques.

It is not （　）to discuss the question again and again.

A:worth B:worthy C:worthwhile D:worthwhile

It is not ______ to discuss the question again and again.

A:worth B:worthy C:worth-while D:worth while

What does the passage mainly discuss

A:The changes of soccer. B:The rules of rugby. C:Different village players. D:The birth of American football.

What does the passage mainly discuss

A:The difference between "scientific" and "unscientific" explanations. B:The difference between human and animal behavior. C:How fear would be explained by the psychologist, physiologist, and molecular biologist. D:How scientists differ in their approaches to explaining natural phenomena.

What does the passage mainly discuss

A:Risk factors in heart attacks. B:Seasonal and temporal patterns of heart attacks. C:Cardiology in the 1980s. D:Diet and stress as factors in heart attacks.

This passage mainly discuss

A:the relationship between a good sex life and a loving affectionate relationship. B:various factors that may contribute to happiness. C:various views about happiness. D:ideal situations in which one finds himself happy.