单项选择题

枪，分为枪身，枪头、枪缨三部分。枪头上包括枪尖和枪刃。枪身末端称为枪把。枪缨的长度不短于（）厘⽶。‌
‌
‌
‏‌

A．20
B．25
C．30
D．35

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In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).A、Building railroads.
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