A. footprint
Đáp án là B
Từ “step” ( bước) ở dòng 2 có thể được thay thế tốt nhất bởi
A. dấu chân
B. hành động
C. cái cân
D. cầu thang
Dẫn chứng: Carver‘s first step was to analyze plant parts to find out what they were made of.
[ Bước tiến/ hành động đầu tiên của Carver là phân tích các bộ phận của thực vật để tìm ra chúng được làm từ cái gì ]
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Nobody answered the door __________?
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Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
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