6.The word "disputes"in line 20is closest in meaning to

(A)discussions

(B)arguments

(C)developments

(D)purchases

7.Which of the following activities was NOT done by Anasazi men?

(A)Making baskets

(B)Planting crops

(C)Building homes

(D)Crafting jewelry.

8.According to the passage,what made it almost impossible for other groups to conquer the Anasazi?

(A)The political and social organization of the Anasazi

(B)The military tactics employed by the Anasazi

(C)The Anasazi's agricultural technology.

(D)The natural barriers surrounding Anasazi willages.

9.The passage supports which of the following generalizations?

(A)The presence of the Spanish threatened Anasazi society.

(B)The Anasazi benefited from trading relations with the Spanish.

(C)Anasazi society exhibited a well-defined division of labor.

(D)Conflicts between neighboring Anasazi villages were easily resolved.

Question 10-19

Barbed wire,first patented in the United States in 1867,played an important part in the development of American farming,as it enabled the settlers to make effective fencing to enclose their land and keep cattle away from their crops.This had a considerable effect on cattle ranching,since the herds no longer had unrestricted use of the plans for grazing,and the fencing led to conflict between the farmers and the cattle ranchers.

Before barbed wire came into general use,fencing was often made from serrated wire,which was unsatisfactory because it broke easily when under strain,and could snap in cold weather due to contraction.The first practical machine for producing barbed wire was invented in 1874by an Illinois farmer,and between then and the end of the century about 400types of barbed wire were devised,of which only about a dozen were ever put to practical use.

Modern barbed wire is made from mild steel high-tensile steel,or aluminum.Mild steel and aluminum barbed wire have two strands twisted together to form a cable which is stronger than single-strand wire and less affected by temperature changes.Single-strand wire,round or oval,is made from high-tensile steel with the barbs crimped or welded on .The steel wires used are galvanized -coated with zinc to make them rustproof.The two wires that make up the line wire or cable are fed separately into a machine at one end.They leave it at the other end twisted-together and barbed.The wire to make the barbs is fed into the machine from the sides and cut to length by knives that cut diagonally through the wire to produce a sharp point.This process continues automatically,and the finished barbed wire is wound onto reels,usually made of wire in length of 400meters or in weights of up to 50kilograms.

A variation of barbed wire is also used for military purposes.It is formed into long cojis or entanglements called concertina wire.

10.What is the main topic of the passage?

(A)Cattle ranching in the United States.

(B)A type of fencing

(C)Industrial uses of wire

(D)A controversy over land use.