B.They start with a movement of a few particles of soil or rock
C.They can be destructive in a matter of hours or minutes
D.All ofthe above
3.Why do researchers develop a new device to monitor signs of landslides?
A.because the new device can measure the site directly
B.because the new device can be sunk into boreholes or fixed above ground
C.because the common methods can cause false alarms
D.because出e common methods are useless
4。Which of the following statements is NOT true of the device,according to Paragraph 47
A.it is filled in with gravel
B.it consists of a steel pipe.
C.It is dropped into a borehole filled with gravel
D.it is connected to a sensor on the surface
5.According to the context,what does the wordpositivesin the fifth paragraph mean?
A.positive electric charges
B.evidences
C.warnings
D.predictions
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