单项选择题

Questions 26 to 28 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions.
Now, listen to the news.
The blasts were triggered by

A．fire.
B．mobile phone signals.
C．body bomb.
D．light.

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单项选择题

单项选择题

Questions 26 to 28 are based on the following news. At the end of the news item, you will be given 15 seconds to answer the questions. Now, listen to the news. The blasts were triggered by 您的浏览器不支持 audio 元素。