A. are always bad for you because they contain too much fat
B. can be unhealthy in the long term and have too little variety
C. are effective and safe if used under a doctor’s supervision
D. usually result in long-term weight loss
Đáp án : B
Thông tin: “they are nearly always too monotonous and sometimes too unhealthy to be followed in long term” = unhealthy, too little variety
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