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

游客2025-04-24 25

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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