原题
From polar bears to short-tailed crickets, many animals practice some form of brood care (caring for offspring). Chenyang Cai and team claim to have found the earliest evidence of this behavior in insects in 163.5-million-year-old remains from the Haifanggou Formation in China, a location that has yielded many fossils, including those of feathered dinosaurs. Cai and team examined 157 specimens of the extinct water boatman species Karataua popovi and noted thirty individuals that appear to carry eggs on one of their legs. This finding establishes brood care in insects approximately 38 million years earlier than previously known.
Which choice best states the main idea of the text?
AResearch shows that feathered dinosaurs inhabited the location that is now the Haifanggou Formation long before K. popovi did.
BCai and team's study of K. popovi fossils suggests that brood care in insects began earlier than formerly established.
CCai and team concluded that K. popovi likely carried their offspring on one of their legs.
DThe Haifanggou Formation is an abundant source of fossilized dinosaurs and K. popovi.
正确答案：B
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