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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The marine life in the Coral Triangle can be best characterized as ______.
A. mysterious
B. remarkable
C. phenomenal
D. diversified
单项选择题
The word shed in the 3rd paragraph means closest to ______ .
A. fear
B. recover from
C. develop
D. suffer from
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