单项选择题


A．which
B．that
C．what
D．where
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单项选择题
One of the causes of earthquake might be that ______.
A．it occurs in the center of the earth, so experts cannot tell when earthquakes will occur
B．there is rushing water in the center of the earth
C．solid rocks under the ground move and strain against each other, causing the earth's surface moving
D．there are other unknown causes
单项选择题
We can infer from the passage that ______.
A．a great mass of solid rock suddenly moves deep inside the earth
B．earthquake usually does great damage to human beings
C．earthquake cannot be measured
D．earthquake takes place with a loud roar
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