单项选择题


Questions 23 to 25 are based on the conversation you have just heard.

A．Until the end of November.
B．From the beginning of April to the end of September.
C．From the 1st October until the 10th December.
D．From the 11th December until the 31st January.
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单项选择题
A．To forbid grazing on marginal lands.B．To plant more trees on marginal lands.C．To establish good ground cover.D．To graze animals rotationally.
A．To forbid grazing on marginal lands.
B．To plant more trees on marginal lands.
C．To establish good ground cover.
D．To graze animals rotationally.
单项选择题
When the author said he was lucky , it means the following except ______.
A．the topic he found in a book a century ago is so strange
B．he often finds that the past has valuable lessons for the future
C．there are many books on electric vehicles in the 20th century
D．books published before 1923 are in the public domain
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