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第一节：完形填空（共10小题；每小题2分,满分20分）
阅读下面短文，掌握其大意，然后从21－30 各题所给的四个选项（A、B、C、和D）中，选出最佳选项，并在答题卡上将该项涂黑。
The experience of jealousy ____21____ enormously from age to age, from culture to culture, from couple to couple, from person to person, and can be different within the same person from time to time.
阅读下面短文，掌握其大意，然后从21－30 各题所给的四个选项（A、B、C、和D）中，选出最佳选项，并在答题卡上将该项涂黑。
The experience of jealousy ____21____ enormously from age to age, from culture to culture, from couple to couple, from person to person, and can be different within the same person from time to time.
