Why does spinning make you dizzy(眩晕的)?

　　Because your brain gets confused between what you're seeing and what you're feeling. The brain senses that you're spinning using special gravity－and－motion－sensing organs in your inner ear, which work together with your eyes to keep your vision and balance stable. But when you suddenly stop spinning the system goes out of control, and your brain thinks you're moving while you're not!

　　Where do feelings and emotions come from?

　　Mostly from an ancient part of the brain called the limbic system. All mammals have this brain area—from mice to dogs, cats, and humans. So all mammals feel basic emotions like fear, pain and pleasure. But since human feelings also involve other, newer bits of the brain, we feel more complex emotions than any other animal on the planet.

　　If exercise wears you out, how can it be good for you?

　　Because our bodies adapt to everything we do to them. And as far as your body is concerned, it's “use it, or lose it”！ It's not that exercise makes you healthy; it's more that a lack of exercise leaves your body weak and easily affected by disease.

　　46. What is the colour of blood in a vein near the surface of the skin?

　　A. Blue.

　　B. Light yellow.

　　C. Red.

　　D. Dark reddish purple.

　　47．Why do some old people look a little shrunken as they age?

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