|Passage IV||Column 2 heading|
31. One of the main ideas established by the passage is that:
A. researchers have nearly exhausted their resources
after spending decades investigating the Sargasso Sea.
B. significant gaps still remain in researchers’ understanding
of the life cycle of eels.
C. eels live their entire lives in the Sargasso Sea, but
no one has ever seen them there.
D. female eels turn into silver eels toward the end of