题目内容
77. As we know, vitamin C is the chief active __________ in lemons.
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78. He's very __________ and has refused six job opportunities without finding one he likes.
79. There is an old Chinese __________ that states, "One generation plants the trees, another gets the shade."
80. The dolphins jumped up suddenly and then disappeared __________ the waves.
81. In the old town of Lijiang, you will find that the __________ is unique among the world's most beautiful places.
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