【小题1】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.【小题2】Why do some old people look a little shrunken as they age?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 bees more bent.【小题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 plex as those of humans.D．Our feelings and emotions e from the most developed area in our brain.【小题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.D
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(答案→)D
解析：本文是一篇科普性文章，作者旨在向我们说明一些与我们的身体有关的信息。
【小题1】解析：选D。细节理解题。根据方框内首段第三句可知，尽管血液在体外显现出红色，但在比较靠近皮肤的静脉血管里呈现的是绛紫色。
【小题2】解析：选D。细节理解题。根据方框内第四段最后两句可知，老年人变矮更多的是因为脊柱变得有点弯曲。故选D项。
【小题3】解析：选A。细节理解题。根据方框内第二段可知，归根到底，大脑可能比心脏更劳累些，故A项判断正确。根据方框内倒数第三段可知，大脑觉得我们在眩晕时，实际上我们并没有，可排除B项；根据方框内倒数第二段并结合常识可排除C、D两项。
【小题4】解析：选B。推理判断题。通读全文可知，本文是一篇科普性文章，作者旨在向我们说明一些与我们身体有关的信息，故B项正确。