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【单选题】
季节变动的特点是( )。A.
呈现出非固定长度的周期性变动
B.
呈现出某种持续向上或持续下降的变动
C.
呈现出波浪形或振荡式变动
D.
在一年内重复出现固定周期的波动
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A.
which
B.
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that
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【单选题】The concept of a'smart city'_________in the Government Work Report for the first time this year， which shows the future direction of China‘s construction.
A.
appeared
B.
was appearing
C.
had appeared
D.
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