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.

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 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.

 

1.D

2.D

3.A

4.B

【解析】本文是一篇科普性文章，作者旨在向我們說明一些與我們的身體有關(guān)的信息。

1.

2.2】解析：選D。細節(jié)理解題。根據(jù)方框內(nèi)第四段最后兩句可知，老年人變矮更多的是因為脊柱變得有點彎曲。故選D項。

3.3】解析：選A。細節(jié)理解題。根據(jù)方框內(nèi)第二段可知，歸根到底，大腦可能比心臟更勞累些，故A項判斷正確。根據(jù)方框內(nèi)倒數(shù)第三段可知，大腦覺得我們在眩暈時，實際上我們并沒有，可排除B項；根據(jù)方框內(nèi)倒數(shù)第二段并結(jié)合常識可排除C、D兩項。

4.4】解析：選B。推理判斷題。通讀全文可知，本文是一篇科普性文章，作者旨在向我們說明一些與我們身體有關(guān)的信息，故B項正確。

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