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单项选择题
Little Hercules is the first remotely controlled vehicle ______.
A. that can be used for deep-sea expedition
B. that is used to explore the "Coral Triangle"
C. that can go as deeply as 2.3 miles undersea
D. that is developed by American scientists
单项选择题
Dr. Riedl and his colleagues found that only 72 papers had ______.
A. carried out diverse tests
B. recruited enough subjects
C. studied allergic responses
D. produced a valid conclusion
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