Early human beings used very fragile（易碎的） houses and boats. Often strong winds would tear roofs from houses or cause high waves that endangered travelers .People's food supplies were similarly vulnerable（易受攻击的）. Even after they had learned how to plant grains, they still needed help from nature to ensure good harvests. Therefore they feared and depended on the power of the wind, which could bring warmth from one direction and cold from another.

　　Using a simple piece of cloth tied to the top of a post to tell the direction of the wind was more dependable than earlier methods, such as watching the rising of smoke from a fire. The connection 1 .The best title for the passage would be______.

　　A. Power of the National Flag

　　B. Uses of Flag C. Types of Flags D. Development of the National Flag

　　2.

　　The underlined word “vulnerable” in Paragraph 3 means_____

　　A. impossible to make sure of

　　B. difficult to find C. likely to be protected

　　D. easy to damage

　　3.

　　The earliest flags were connected with heavenly power because______

　　A. they were believed to stand for natural forces

　　B. they could bring good luck to fighters

　　C. they were handed down by the ancestor

　　D. they could tell wind direction

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