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
A．In other wordsB．IndeedC．In a senseD．In a word
A．In other words
B．Indeed
C．In a sense
D．In a word
单项选择题
A．constitutionB．rolesC．formationsD．regulations
A．constitution
B．roles
C．formations
D．regulations
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