Once Tu __8__(return) home after traveling for six months.Her little daughter didn’t recognize her and hid from the“strange woman”．To do research，Tu also had to move around a lot.

　　Finally，Tu found artemisinin (青蒿素) in sweet wormwood in 1971.She spent the next decades __9__(try)to improve the medicine.According to World Health Organization，about 200 million people suffer __10__ malaria around the world，and about half a million die each year.Artemisinin is still the most effective treatment against malaria known today.

　　Tu never complains about how hard she works.“I feel more rewarded when I see so many cured patients，” she said.

　　F

　　(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.

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