填空题

Observation posts have been set up alongside the most dangerous craters to ______.

【参考答案】

to detect and warn people of imminent eruptions
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填空题
Hot mineral springs could be used ______.
单项选择题
A．Go to her place as it is quieter.B．Relax for a while from his studies.C．Try to be more attentive when he studies.D．Go to the study lounge to continue his study.
A．Go to her place as it is quieter.
B．Relax for a while from his studies.
C．Try to be more attentive when he studies.
D．Go to the study lounge to continue his study.
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