М. М. Кутепова The World of Chemistry Мир

Dalton saw that the existence of atoms will explain the law of constant composition.

Atoms’ existence could explain other observations that had been made about chemical reactions.

Can atoms be created or destroyed?


Section 4
Each problem in this section consists of a sentence in which one word or phrase has been underlined. From the four choices given, you should choose the one word or phrase which could be substituted for the underlined word or phrase without changing the meaning of the sentence.
Example: This experiment is rather dangerous to make.

1. 
   important c) hazardous
   
2. 
   significant d) interesting
   

The correct answer is (c), so you should mark answer (c).

5. 
   Thousands of years ago people valued gold as a rare substance.
   

1. 
   thought of c) considered
   
2. 
   appreciated d) respected
   

5. 
   The universal desire for gold made alchemy a formal discipline.
   

1. 
   lust c) ambition
   
2. 
   admiration d) dream
   

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5. 
   These phenomena have long been of interest to research workers.
   

1. 
   scientists c) scholars
   
2. 
   examiners d) investigators
   

5. 
   These reactions are of fundamental significance.
   

1. 
   interest c) attention
   
2. 
   importance d) concern
   

5.