Reading Practice ข้อสอบแข่งขันระดับมัธยม

The energy content of food is measured in calories. The calorie is defined as the heat energy needed to raise the temperature of 1 kilogram of water from 14.5 ~ to 15. 5'C. The calorie used in nutrition is sometimes spelled with a capital C to distinguish it from the much smaller energy calorie used in physics and chemistry. But it is more properly called the kilogram - calorie, or kilo-calorie, because it is precisely 1,000 times the smaller unit. or gram - calorie. The energy content of food is stored in the chemical bonds that link its atoms and molecules.
 
1. What is the main subject of the passage?
(A) A branch of chemistry
(B) A type of food
(C) A unit of energy
(D) An alphabet system
 
2. What does the author define in lines 1-2?
(A) The molecule
(B) The kilogram
(C) The kilo-calorie
(D) The gram - calorie
 
3. As compared to the calorie used in nutrition, the calorie used in physics and chemistry
(A) is smaller
(B) is measured more precisely
(C)varies more in its spelling
(C) contains 1,000 more gram- calories
 
4.The word properly is closest in meaning to which of the following?
(A)Cleanly
(B)Modestly
(C)Politely
(D)Correctly
 
5.The word its could best be replaced by
(A)the energy's
(B) the food's
(C) the link's
(D) the molecule's
 
6. What does the passage imply about food with a high calorie content?
(A) It can yield a lot of heat energy
(B It has a high percentage of water
(C)It should be stored only in cool places
(D)It is hotter than food that has fewer calories


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