Read the following passage and blacken the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
The history of clinical nutrition, or the study of the relationship between health and how the body takes in and utilizes food substances, can be divided into four distinct eras: the first began in the nineteenth century and extended into the early twentieth century when it was recognized for the first time that food contained constituents that were essential for human function and that different foods provided different amounts of these essential agents. Near the end of this era, research studies demonstrated that rapid weight loss was associated with nitrogen imbalance and could only be rectified by providing adequate dietary protein associated with certain foods.
The second era was initiated in the early decades of the twentieth century and might be called “the vitamin period.” Vitamins came to be recognized in foods, and deficiency syndromes were described. As vitamins became recognized as essential food constituents necessary for health, it became tempting to suggest that every disease and condition for which there had been no previous effective treatment might be responsive to vitamin therapy. At that point in time, medical schools started to become more interested in having their curricula integrate nutritional concepts into the basic sciences. Much of the focus of this education was on the recognition of deficiency symptoms. Herein lay the beginning of what ultimately turned from ignorance to denial of the value of nutritional therapies in medicine. Reckless claims were made for effects of vitamins that went far beyond what could actually be achieved from the use of them.
In the third era of nutritional history in the early 1950's to mid-1960's, vitamin therapy began to fall into disrepute. Concomitant with this, nutrition education in medical schools also became less popular. It was just a decade before this that many drug companies had found their vitamin sales skyrocketing and were quick to supply practicing physicians with generous samples of vitamins and literature extolling the virtue of supplementation for a variety of health-related conditions. Expectations as to the success of vitamins in disease control were exaggerated. As is known in retrospect, vitamin and mineral therapies are much less effective when applied to health-crisis conditions than when applied to long-term problems of under nutrition that lead to chronic health problems.
It can be inferred from the passage that which of the following discoveries was made during the first era in the history of nutrition?
A. Protein was recognized as an essential component of diet.
B. Vitamins were synthesized from foods.
C. Effective techniques of weight loss were determined.
D. Certain foods were found to be harmful to good health.
Đáp án A.
Key words: discoveries, first era, history of nutrition
Clue: Near the end of this era, research studies demonstrated that rapid weight loss was associated with nitrogen imbalance and could only be rectified by providing adequate dietary protein associated with certain foods: Gần cuối giai đoạn này, các nghiên cứu chứng minh rằng việc giảm cân nhanh chóng có liên quan tới việc mất cân bằng nitơ và chỉ có thể được điều chỉnh bằng việc cung cấp đầy đủ protein trong chế độ ăn kết hợp với các loại thực phẩm nhất định.
A. Protein was recognized as an essential component of diet: protein được nhìn nhận như một thành phần thiết yếu của chế độ ăn.
B. Vitamins were synthesized from foods: vitamin được tổng hợp từ thực phẩm.
C. Effective techniques of weight loss were determined: xác định được những kỹ thuật hiệu quả để giảm cân.
D. Certain foods were found to be harmful to good health: một số loại thực phẩm nhất định được phát hiện ra là có hại cho sức khỏe.
Vậy đáp án chính xác là A