单词辨音(共5小题，每小题1分，共5分) 从A、B、C、D四个选项中找出划线部分发音与其它三个选项不同的选项。
Taking the bus to work is one of________parts of his life．
If you are in trouble，you can________the police________help．
It’s________cold________go swimming in winter in Beijing．
—How do you learn English？ —I learn English________practicing conversations with friends．
—How do you study________a test？ —I often study________a group．
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