题目内容
（请给出正确答案）
[主观题]
听力原文： In newspaper articles, radio and television announcements and even mobile phone
messages, Spaniards are encouraging one another to take part in a planned mass demonstralion this evening to protest against terror and yesterday's bloody attacks. Across Spain, people held candlelit vigils throughout the night, expressing their sympathy with the numerous victims. The Spanish government has called for three days of national mourning. Meanwhile the official investigation and public speculation into who was behind the atrocity continues.
What is the mass demonstration about？
A．Radio and television announcement.
B．Protest against terror and attacks.
C．National mourning.
D．Official investigation and public speculation.
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