2017届高考北师大版英语二轮复习单元限时规范练：选修7 Unit 21《human biology》（含解析）_高考复习指南

　　D．they know they are useful

　　答案：C　细节理解题。根据前三段可知，过节爷爷奶奶被忽略会不高兴。

　　3．Why does the author compare human beings to candles?

　　A．Because people won't have good eyesight.

　　B．Because few people can live a long time.

　　C．Because everyone will be in the aging group.

　　D．Because life on the earth is relatively short.

　　答案：D　推理判断题。依据倒数第二段的“Chances are high that their hearts will stop one day.”可知，人生是短暂的。

　　4．According to the passage the author intends

　　A．to tell the old are living a quite lonely life

　　B．to encourage people to visit their grandparents

　　C．to imply few take care of their grandparents

　　D．to show he is very kind to his grandparents

　　答案：B　推理判断题。作者在文中谈到了节假日探望祖父母的重要性，尾段的“Don't forget to treat grandparents with respect”提醒读者要尊敬爷爷奶奶，因此选项B正确。

　　1．tightly adv. 紧紧地；坚固地

　　2．weakness n. 缺点；弱项

　　3．sensible adj. 理性的；明智的

　　4．decorate vt. 装饰

　　5．essential adj. 基本的；必要的

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