2. 外语
  3. The frequent ______ from cold to warm weather this spring have caused much illness.

The frequent ______ from cold to warm weather this spring have caused much illness.

admin2013-01-19  20
问题 The frequent ______ from cold to warm weather this spring have caused much illness.
选项 A、transmissions
B、transactions
C、transformations
D、transitions
答案D
解析 (transition过渡)。句意为：今年春天时冷时暖引发多种疾病。A．transmission传染；B．transaction交易；C．transformation转变，转换。
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