A. The initial movement is hard to spot
C. They can be destructive in a matter of hours or minutes
3. Why do researchers develop a new device to monitor signs of landslides?
B. because the new device can be sunk into boreholes or fixed above ground
D. because the common methods are useless
A. it is filled in with gravel
C. It is dropped into a borehole filled with gravel
5. According to the context, what does the word positives in the fifth paragraph mean?
B. evidences
D. predictions
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