A. we know about butterfly evenness distribution to some extent
B. we don't know anything about butterfly evenness distribution
C. there are many other things that we don't know about butterfly evenness distribution
D. we know much about butterfly evenness distribution
Đáp án là A. Ý trong bài: However, for butterflies, variation of species richness within temperate or tropical regions, rather than between them, is poorly understood.
( poorly understood : hiểu biết nông cạn, nghèo nàn)
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