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 lost 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.

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

　　A. Blue.

　　B. Dark reddish purple.

　　C. Red.

　　D. Light yellow.

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

　　A. Because they are more easily affected by gravity.

　　B. Because their spine is in active use.

　　C. Because their spine becomes more bent.

　　D. Because they keep growing backwards.

　　69. Which of the following statements about our brain is true?

　　A. In the long run, our brain probably works harder than our heart.

　　B. When our brain senses the spinning, we will fell dizzy.

　　C. The brains of the other mammals are as complex as those of humans.

　　D. Our feelings and emotions come from the most developed area in our brain.

　　70. What is the main purpose of the selection?

　　A. To give advice on how to stay healthy.

　　B. To challenge new findings in medical research.

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