Quiz Four

Written Part
Part I Reading Comprehension

Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C, and D. You should decide on the best choice and write the corresponding letter on your Answer Sheet. Then write your translation of the underlined sentence on your Answer Sheet.

Passage One

　　　 We have learned that energy can produce changes in matter. When the change does not alter the identity of a substance, it is called a physical change. Cutting wood is an example of physical change.

　　　The transformation of energy often does alter the identity of a substance. Such a change is called a chemical change. Burning wood is an example of chemical change.

　　　In the cutting of wood, we know that its identity is not altered and no new substance is formed, hence the wood has undergone a physical change. But the burning of wood has altered its properties and new substances-gases and ashes-have been formed, hence the wood has undergone a chemical change.

Key

1. D	2. D	3. D	4. C
5. 然而，木柴的燃烧已改变了木柴的特性，而且新的物质--气体和灰烬　--也得以形成，因此木柴便经历了一种化学变化。

1. ________ is called a chemical change.
	A. Water which is changed into vapour
	B. Water which turns into ice
	C. Cutting wood
	D. The change which alters the identity of a substance
2. Cutting wood is a physical change. Why?
	A. Because wood can be used by people.
	B. Because wood can be cut.
	C. Because wood can flow on water.
	D. Because no new substance is formed when it is cut.
3. Why is burning wood called a chemical change? Because ________.
	A. it gives off light
	B. it gives out heat
	C. it turns black
	D. new substances have been formed
4. What does the passage tell us?
	A. What is a physical change?
	B. What is a chemical change?
	C. The physical change and the chemical change.
	D. Energy can produce changes in matter.
5.But the burning of wood has altered its properties and new substances-gases and ashes-have been formed, hence the wood has undergone a chemical change.


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