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第472题：裂解炉开年前炉膛置换的主要目的是防止因燃料阀门泄露时，炉膛达到爆炸极限，造成爆鸣或爆炸
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( ) 39. The World Wetlands Day is on _______．
A．February 2 B．June 25 C．April 22 D．March
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( ) 40. We must protect wetlands because _______．
A．they are home for wildlife B．they can prevent flood
C．they can offer food to the animals and birds D．all of the above
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) 1. —Is it far from here to the bank?
—Not very, only________．
A. 20 minute’s walk B. 20 minutes walk
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8. —Where would you like to go, Jinan or Qufu?
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9 — The documentary A Bite Of China II is quite popular around China recently. How do you like it? ______.
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10. There are three English-books on the shelf, but ______ of them is mine.
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11. When the parents arrived at the hall, the students _______ their projects.
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12. This week, the _______ seems to change every day: one day is hot; the next day is cold.
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19. — Is this park youve visited recently?
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21. — Could you tell me when Mr. Li ________ in Huaibei?
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24.In fact, my parents are not only kind to me, but also strict ________ me.
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25. The boy_____ a yellow sweater can_____ himself now．
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( ) 26. Where does the writer of "The little Prince" come from?
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( ) 27. What does the prince do after the fox tells him a secret?
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( ) 29. When a baseball player hits the ball, he must ______ to get a point.
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( ) 30. When was the importance of touching all the bases shown?
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( ) 31. Who hit home run number 715?
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( ) 32. What does the expression “to touch all bases” mean?
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( ) 33. The Chinese Yellow Sea Wetlands are in the _______ of China．
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( ) 34. Usually the weather in the wetlands is _______．
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( ) 35. The World Wetlands Day is on _______．
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( ) 37.The greatest river for navigation is ___________.
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( ) 38. From a dam, people can use the water for ___________.
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C. irrigation and making electricity D. washing clothes
