Sao đáp án D vậy mình thấy B cũng hợp lí mà
" But to count, animal has to recognize that each object in a (set corresponds to) a single number and that the last number in a sequence represents the total number of objects"
"The theory has been tested on eleven dogs. They were first (shown treats) before a screen was lowered so that the treats were (out of sight)"
-> Cụm mình trong ngoặc nghĩa là gì á mấy bạn
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Sinh Học lớp 12
