"which of these should not normally appear in urine? "

The answer is glucose.

Glucose can appear in urine in case of Diabetes. In diabetes, the glucose in the blood it's in very high amounts, due to the lack of insulin or because the glucose receptors are not working properly. Because of that high concentration of glucose in the blood it is likely thats going to appear in the urine.

We can use solar powered cars or ride bikes instead of cars that burn fossil fuels