24.
(A)exist
(B) existing
(C) have existed
(D) be existing

20. This parliament member suggested that our government ________ at once for energy saving. (A)takes action(B) take action (C) took action (D) is taken action

21. (A)from(B) by (C) with (D) off

22. (A)when(B) where (C) which (D) while

23. (A)accounts for(B) accounts in (C) accounts of (D) accounts with

25. (A)drink(B) genes (C) link (D) study

26. What is the passage mainly about? (A)Offering an answer to the making of Damascus steel. (B)Introducing varieties of Damascus steel in different ages. (C) Arguing for a better method to produce modern weapons. (D) Comparing the differences between two metallurgic methods.

27. Which of the following statements regarding Damascus steel is true? (A)The method of producing Damascus steel will never be found. (B)Damascus steel contains larger amount of carbon than ordinary steel. (C) Keys made from Damascus steel need to be reheated at higher temperature. (D) Damascus steel has been used in manufacturing automobile parts for decades.

28. Why are the Crusaders mentioned in the second paragraph? (A)Because they secured their borders after fighting with the Saracens. (B)Because they learned a skill to cut a feather into two halves in midair from the Europeans. (C) Because they introduced Damascus steel in the Middle East to the European world. (D) Because they found a method to produce Damascus steel when battling in the Middle East.

29. What does the word amenable in the third paragraph refer to? (A)Economical. (B)Fractional. (C) Flexible. (D) Delicate.

30. According to the passage, who are Wadsworth and Sherby? (A)They are metallurgical historians revealing the background of producing Damascus swords. (B)They are metallurgists at Stanford University attempting to produce durable or plastic steel. (C) They are warriors in modern America, who still used Damascus swords in daily-life business. (D) They are crusaders of metallurgy trying to discover ways of making better weapons.