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

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热门试题

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

填空题

When people realize they lose control over their impressions in others’ eyes, they will state firmly their need for privacy.