TOEFL Reading Comprehension - Lesson 2
Đ c đo n văn sau và tr l i các câu h i:ọ ạ ả ờ ỏ
Carbohydrates, which are sugars, are an essential part of a healthy diet. They provide the
main source of energy for the body, and they also function to flavor and sweeten foods.
Carbohydrates range from simple sugars like glucose to complex sugars such as amylose
and (5) amylopectin. Nutritionists estimate that carbohydrates should make up about
one-fourth to one-fifth of a person’s diet. This translates to about 75-100 grams of
carbohydrates per day.
A diet that is deficient in carbohydrates can have an adverse effect (10) on a person’s
health. When the body lacks a sufficient amount of carbohydrates it must then use its
protein supplies for energy, a process called gluconeogenesis. This, however, results in a
lack of necessary protein, and further health difficulties may occur. A lack of
carbohydrates can also lead to ketosis, a build-up of ketones 15 in the body that causes
fatigue, lethargy, and bad breath.
1. What is the main idea of this passage?
(A) Carbohydrates are needed for good health.
(B) Carbohydrates prevent a build-up of proteins.
(C) Carbohydrates can lead to ketosis.
(D) Carbohydrates are an expendable part of a good diet.
2. The word “function” as used in line 2 refers to which of the following?
3. The word “range” as used in line 3 is closest in meaning to which of the following?