Jawaban:

1. If color is solely the way physics describes it, the visible spectrum of light waves, then black and white are outcasts and don't count as true, physical colors. Colors like white and pink are not present in the spectrum because they are the result of our eyes' mixing wavelengths of light. Therefore, black and white tv isn't a color tv.
2. Soap and water do make the body clean, but the air doesn't. When you scrub your body with water and soap it cleans it. You clean yourself after bath why rubbing the towel to your body. When you rub your body to the towel, your dead skin will stick to the towel. Therefore, the towel can be dirty after you have a bath.
3. Yes, we can trust a nurse whose husband sells the coffin because her husband can buy it cheap and sell it for money, i.e. show no particular objection to the nurse that makes her suspicious.