Reading passages

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 
 
30 -In the process of vulcanisation, the principle 
is, that ---- .
A) the heat applied to the mixture should be high 
enough for rapid evaporation 
B) the sulphur contained in the rubber should be 
extracted as much as possible 
C) how hard or flexible the rubber becomes depends, 
on its sulphur content 
D) the more sulphur is used, the harder and the more 
elastic the rubber becomes 
E) the rubber can be separated from water by being 
heated at high temperatures 
The origins of a written literature can be found in 
most of the civilisations of the ancient world; in 
India. China and among the Jewish people, whose 
great work of literature is the Old Testament of the 
Bible. However, it is the Greeks whose literature is 
taken to represent the start of Western literature. 
Their greatest single contribution was drama, a form 
of literature that has continued undiminished to the 
present day. Other literary forms that developed from 
the time of the ancient Greeks and Romans onward 
have been poetry in its many different styles and 
forms, the essay, biography and autobiography, and 
the novel. Other types of written work from these 
periods, dealing with such matters as history, 
philosophy, politics, religion, science and criticism 
may also be classified as literature from the point of 
view of style.