考试网 >> 外语考试 >> 托福 >> 托福模拟题 >> TOEFL试题（1）

发布时间：2006-06-21 20:59     点击：

Another unusual feature of glass is the manner in which its viscosity changes as it turns from a cold substance into a hot, ductile liquid. Unlike metals that flow or "freeze" at specific temperatures glass progressively softens as the temperature rises, going through varying stages of malleability until it flows like a thick syrup. Each stage of malleability allows the glass to be manipulated into various forms, by different techniques, and if suddenly cooled the object retains the shape achieved at that point. Glass is thus amenable to a greater number of heat-forming techniques than most other materials.

10. Why does the author list the characteristics of glass in lines 1-5?

(A) To demonstrate how glass evolved

(B) To show the versatility of glass

(C) To explain glassmaking technology

(D) To explain the purpose of each component of glass

11. The word "durable"' in hue 3 is closest in meaning to

(A) lasting

(B) delicate

(C) heavy

(D) Plain

12. What does the author imply about the raw materials used to make glass?

(A) They were the same for centuries.

(B) They arc liquid

(C) They are transparent

(D) They are very heavy.

13. According to the passage, how is glass that has cooled and become rigid different from most other rigid substances?

(A) It has an interlocking crystal network.

(B) It has an unusually low melting temperature.

(C) It has varying physical properties.

(D) It has a random molecular structure.

14. The word "customarily" in line 13 is closest in meaning to

(A) naturally

(B) necessarily

(C) usually

(D) certainly

15. The words "exposed to" in line 19 are closest in meaning to

(A) hardened by

发表评论： 匿名发表 用户名: 查看评论

您将承担一切因您的行为、言论而直接或间接导致的民事或刑事法律责任 留言板管理人员有权保留或删除其管辖留言中的任意内容 本站提醒：不要进行人身攻击。谢谢配合。