The metal ________was first used was copper ______ it was easily obtained in its pure(纯的)state.

您可能感兴趣的试题

• 1It was _______ that they planned to have a picnic.

  A. such fine weather B. so fine a weather C. such a fine weather as D. such a fine weather

  点击查看答案进入在线练题题不想做，我帮你做
• 2They are ___ students that they all performed well in the nationwide examinations.

  A. so diligent B. such diligent C. so much diligent D. such very diligent

  点击查看答案进入在线练题题不想做，我帮你做
• 3_____ I catch a cold, I have pain in my back.

  A. Every time B. Though C. Even D. Where

  点击查看答案进入在线练题题不想做，我帮你做
• 4Once _____ of the necessity of a move，he worked hard to find a new home.

  A. convinced

  B. be convinced

  C. convincing

  D. having convinced

  点击查看答案进入在线练题题不想做，我帮你做
• 5–How did you pay the workers? –As a rule ，they were paid by ______.

  A. the hour

  B. an hour

  C. hour

  D. the time

  点击查看答案进入在线练题题不想做，我帮你做
• 6 Some plants are so sensitive pollution that they can only survive in a perfectly c1ean environment.

  A)from B)against C)to D)with

  点击查看答案进入在线练题题不想做，我帮你做
• 7 The council lays rules about the assignment of rooms.

  A)down B)off C)out D)over

  点击查看答案进入在线练题题不想做，我帮你做
• 8 It requires us courage and patience to go the undertaking.

  A) with B)through C)in for D)from 

  点击查看答案进入在线练题题不想做，我帮你做
• 9I. left for the office earlier than usual this morning traffic jam.

  A) in line with B)in case of C)for the sake D)at the risk of

  点击查看答案进入在线练题题不想做，我帮你做
• 10During the lecture, the speaker occasionally _____ his point by relating his own experiences.

  A) illustrated

  B) hinted

  C) cited

  D) displayed

  点击查看答案进入在线练题题不想做，我帮你做