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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. | 
