What drove our ancestors to move from the trees into the plains, and on into all possible areas and environments? The wider the spread of a species, the better its chance of survival.

　　Perhaps the best reason for exploring space is this genetic tendency to expand wherever possible.

　　Nearly every successful civilization has explored, because by doing so, any dangers in surrounding areas can be identified and prepared for.

　　Without knowledge, we may be completely destroyed by the danger. With knowledge, we can lessen its effects.

　　Exploration also allows minerals and other potential(潜在的)resources to be found. Even if we have no immediate need of them, they will perhaps be useful later.

　　Resources may be more than physical possessions.

　　Knowledge or techniques have been acquired through exploration. The techniques may have medical applications which can improve the length or quality of our lives.

　　We have already benefited from other spin­offs including improvements in earthquake prediction, in satellites for weather forecasting and in communications systems. Even non­stick pans and mirrored sunglasses are by­products(副产品)of technological developments in the space industry!

　　While many resources are spent on what seems a small return, the exploration of space allows creative, brave and intelligent members of our species to focus on what may serve to save us.

【2017届高考英语（重庆专用）二轮精练：选修7 unit2 Robots单元测试】相关文章：

★ 【浙江专用】2014届高考英语一轮复习课时作业(四十)选修8Unit 5《Meeting your ancestors》

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习书面表达专题训练：Ⅱ卷强化增分练 训练3（含解析）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修8 unit5《Meeting your ancestors》

★ 【三维设计】2017届高考英语（江苏专用）二轮复习阅读理解解题技法示范课件：4

★ 【浙江专用】2014届高考英语一轮复习课时作业(三十)选修6Unit 5《The power of nature》

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习短文改错专题训练：考法2 句法错误（含解析）

★ 【人教版】2014届高考英语一轮复习指导考点针对练：选修8 unit1《A land of diversity》

★ 【三维设计】2017届高考英语（江苏专用）二轮复习写作增分锦囊课件：6 书面表达常见错误及对策

★ 【课堂新坐标】2017届高考英语（通用版）二轮复习短文改错专题训练：模式2 多一词（含解析）

★ 【三维设计】2017届高考英语（江苏专用）二轮复习课件：必修1 Unit 3《Looking good feeling good》