2．解析：　指代判断题。根据文章第二段第二句“A pair of LEDs fitted on the robot light up the dirty scenery”并结合下文可推知，此处的it代指的是the dirty scenery，故答案D符合文意。

　　答案：　D

　　3．解析：　细节理解题。根据文章第二段第一句“The robot is designed to snake through dark，narrow air conditioning ducts (管道) and clean them.”和第三段的第二句“The robot can clean off lots of dirt...”可知，这种机器人可以清理管道里的垃圾。

　　答案：　A

　　4．解析：　细节理解题。根据文章第四段的第二句和第三句“EPSCO had cleaning equipment，but it needed someone to get into those ducts to

　　the dirty，dangerous work.Across India，for example，the task still falls to children”可知，EPSCO公司在过去经常雇佣小孩来清理管道垃圾。

　　答案：　B

　　5．解析：　段落大意题。根据文章最后一段的前两句“Mr Azad and his ten employees are currently exploring robot designs to examine oil tanks or sewage (污水) pipes.Their biggest challenge is to make the robots user­friendly enough.”和整体理解可知，本段主要讲的是Azad团队正在致力于改善自己的机器人设计，故答案D符合文意。

　　答案：　D.阅读理解2017·山东省潍坊市五校联合高三下学期期中考试At times my mom has been uncomfortable seeing these qualities in me.For example，when I was 12，I went to Puerto Rico all by myself to stay with my grandmother for the summer.My mom was extremely nervous about it.She kept telling me how things were different in Puerto Rico，to always put on sunscreen，not to wander away from my grandmother，and other warnings.She helped me pack and did not leave the airport until she saw my plane take off.

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