$\text{1B. properly 2B. provide 3A. prefer 4B. much 5D. investigated 6C. as 7A. increased 8C. nutritional 9D. affect 10D. habits}$
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$\text{1C. Communication Vì bài đọc nói về các phương thức giao tiếp, bao gồm cả cở chỉ, lời nói, kí hiệu, tín hiệu và biểu tượng, nên Communication - Giao tiếp là tiêu đề phù hợp nhất.}$
$\text{2D. That it is the most advanced form of communication. Ta dựa vào: Although speech is the most advanced form of communication, there are many ways of communicating without using speech.}$
$\text{3C. a symbol Ta dựa vào: In some cultures, applauding in a theater provides performers with an auditory symbol of approval.}$
$\text{4B. Because people wanted to communicate across long distances. Ta dựa vào: As a result, means of communication intended to be used for long distances and extended periods are based upon speech. Radio, television, and the telephone are only a few.}$
$\text{5A. signals, signs, symbols, and gestures are forms of communication. Ta dựa vào: Although signals, signs, symbols, and gestures are very useful, they do have a major disadvantage. They usually do not allow ideas to be shared without the sender being directly adjacent to the receiver. As a result, means of communication intended to be used for long distances and extended periods are based upon speech.}$