阅读下列短文,从每题所给的四个选项(a、b、c和d)中,选出最佳选项,并在答题卡上将该项涂黑。
a
upon entering college, yang yi was uncertain about a lot of things. however, the 19-year-old international economics and trade student was certain about one thing: she wanted to participate in animal welfare efforts.
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