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【简答题】
A．by keeping its original shape and color
B．in the life of cut flowers
C．to produce carbon dioxide
D．for as long as possible
E. by controlling temperature
F. to replace the water and solution every day A few facts will help you keep cut flowers ______.
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参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. The pen name Mark Twain came from____...
A.
his father’s experience as a boatman
B.
his friends on the bank of the Mississippi River
C.
the call of the boatmen on the Mississippi River
D.
the boat on the Mississippi River