【C8】
A．circles
B．cycles
C．intervals
D．periods
请帮忙给出正确答案和分析，谢谢！
[A] stages [B] periods [C] years [D] sessions
We have three periods of chemistry a week.（英译中)
A．rankB．listC．ageD．period
A．yearsB．decadesC．centuriesD．periods
【C16】A．gapsB．ceasesC．intervalsD．distances
【C7】A．intervalB．durationC．spanD．period
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