2017高考英语（人教版）选修7U2一轮夯实练习及答案

　　选修7

　　(2016·四川绵阳市高三二诊考试)Many teachers believe that hands－on experience is the __1__(good) way to learn.

　　A group of students in the United States are putting that belief to the test. They __2__ (success)

　　designed

　　and

　　built

　　a

　　robot

　　for

　　discovering unexplored mines __3__

　　the bottom of the sea. Students made the robot __4__(answer)

　　a challenge from the U．S. Department of Defense.

　　The students recently tested the underwater vehicle __5__(call) PerseusⅡ in a 95－meter－long tank of water at the Stevens Institute of Technology.

　　The robot costs about $15，000 to build. The students use a video game control to direct __6__(it) movements in the tank.

　　What’s more，devices known as Japters __7__ (able) the robot to go up，down and toward its target in the water. Video cameras on the robot send images back to a computer through a 13－meter－long cable.

　　Perseus Ⅱ also has __8__ set of lasers (激光)，which are used to measure the size of an object.

　　The robot is the creation of five undergraduate students. For over six months，they worked up __9__ 20 hours a week to design and build Perseus Ⅱ.

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