单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A．Raising money.
B．Gathering support from others.
C．Giving speeches.
D．Choosing the official candidate for each political party.

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填空题

The author does an assessment of all high-risk urban areas in the U.S.

填空题

A bird flu, a massive earthquake, a monster storm and a terrorist attack are all threats to major cities in the U.S.

Questions 23 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。