A．Because their spine is in active use.

　　B．Because they are more easily affected by gravity.

　　C．Because they keep growing backwards.

　　D．Because their spine becomes more bent.

　　3．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 feel 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.

　　4．What is the main purpose of the selection?

　　A．To give advice on how to stay healthy.

　　B．To provide information about our body.

　　C．To challenge new findings in medical research.

　　D．To report the latest discoveries in medical science.

　　考点2、社会现象类

　　例2、(2016·湖北，D)A German study suggests that people who were too optimistic about their future actually faced greater risk of disability or death within 10 years than those pessimists who expected their future to be worse.

　　The paper, published this March in Psychology and Aging, examined health and welfare surveys from roughly 40,000 Germans between ages 18 and 96.The surveys were conducted every year from 1993 to 2003.

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