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 -From its description, we can say that latex ----


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28 -From its description, we can say that latex ---- . 
A)  is a hard substance similar to rubber 
B)  must be a fairly thin, white liquid 
C)  is almost entirely pure rubber 
D)  is a by -product of rubber 
E)  is less useful than crude rubber 
29 –It’s stated in the passage that untreated crude rubber is not used in industry, because --
- . 
A)  its content of sulphur carries a nasty odour 
B)  its milky colour is undesirable 
C)  it lacks any kind of elasticity 
D)  it's neither hard nor strong enough 
E)  it contains far too many impurities 

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