An ant is an insect. It belongs to the family formicidae. It is social in habit and lives together in organized colonies. Ants occur worlwide, they are especially common in hot climates. They range in size from about 2 to 25 mm. Their colour is usually yellow, brown, red, or black. An ant typically has a large head and a slender oval abdomen. This abdomen is joined to the thorax, or midsection, by a small waist. It has two sets of jaws; the outer pair and the inner pair. The outer pair is used for carrying objects such as food and for digging. Whereas the inner pair is used for chewing. There are usually three castes, or classes, within a colony. They are queens, males, and workers. Some species of ants live in the nests of other species as parasites. In these species, the parasite larvae are given food and nourishment by the host workers. Most ants live in nests, which may be located in the ground or under a rock. They may also build nests above ground from twigs, sand, or small rock. Some species live in trees or in the hollow stems of weeds. Tailor ants in the tropics of Africa make nests of leaves and similar materials. They use silk secreted by the larvae to hold the leaves together. Dolichoderus, another genus of ants, glues together bits of animal feces for its nests.15. What is the text about?
A. How ants build their nests.
B.The member family Formicidae
C. General information about ants.
D. Ant's typical physical appearancee.

16. How do the parasite ants obtain food and nutrition?
A. By carrying food objects.
B. From the host workers.
C. By making nests of leaves
. D. From the ground or under a rock. a

17. Which ants make nests of leaves and similar material?
A. Family Formicidae.
B. Dolichoderus
. C. Parasite
D. Tailor

18. "An ant typically has a large head and ..." (paragraph 2) The underlined word is closest in meaning with ...
A. exactly
B. generally
C.obviously
D. populary

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