Reading passages

In a popular sense, "insect" usually means the 
familiar pests or disease carriers. Many insects, 
however, are beneficial from a human viewpoint; 
they pollinate plants, produce useful substances, 
control pest insects, act as scavengers, and serve 
as food for other. Furthermore, insects are 
valuable objects of study in elucidating many 
aspects of biology. Much of our knowledge of 
genetics has been gained from fruit fly 
experiments and of population biology from flour 

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beetle studies. Insects are often used in 
investigations of hormonal action, nerve and sense 
organ function, and many other physiological 
processes as well. 
 223- The passage is mainly about ............... .
A) the benefits of insects, contrary to the negative 
assumptions about them 
B) the methods to get rid of pests in farming 
C) the importance of insects in food production 
D) a new type of insect employed in genetics 
E) the relationship between insects and 
physiological processes 
224- All the following benefits of insects are 
referred to by the author except the fact that they 
............... .
A) help to eradicate harmful insects 
B) are eaten by other insects 
C) are used in hormonal experiments 
D) eat the remains of plants and animals 
E) are believed to have curative powers 
225- Insects are regarded as valuable in biology 
because ................. .
A) scientists have grown used to working with 
them 
B) they enlighten many dark sides in this field 
C) they have many similarities with mankind
D) people consider them to be good-natured
E) of their low cost and simplicity