单项选择题

A．When it is breeding.
B．When it feels threatened by humans in its territory.
C．When its offspring is threatened.
D．When it is suffering from illness.
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单项选择题
A．Because the waves coming from the center of a quake can spread to these places.B．Because there are the thickness of rocks making up the earth’s crust.C．Because some parts of the earth are more likely to have quakes than others.D．Because-mountainous areas are easy to have earthquakes.
A．Because the waves coming from the center of a quake can spread to these places.
B．Because there are the thickness of rocks making up the earth’s crust.
C．Because some parts of the earth are more likely to have quakes than others.
D．Because-mountainous areas are easy to have earthquakes.
单项选择题
A．It is shiny all the day.B．It is a desirable room.C．It is old and shabby.D．It costs a lot.
A．It is shiny all the day.
B．It is a desirable room.
C．It is old and shabby.
D．It costs a lot.
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