单项选择题

A．Significantly increasing the temperature of the Earth.
B．Significantly cooling the Earth.
C．Keeping the atmosphere reasonably warm.
D．Causing severe pollution.
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单项选择题
A．Their languages are too simple.B．Animals can’t domesticate other beings.C．Animals’ cultures don’t have a long history.D．Animals can’t share their cultures with other beings.
A．Their languages are too simple.
B．Animals can’t domesticate other beings.
C．Animals’ cultures don’t have a long history.
D．Animals can’t share their cultures with other beings.
单项选择题
A．Leaders of the southern rebellion.B．Slaves in the southern states.C．Northern opponents of the war.D．Southern soldiers.
A．Leaders of the southern rebellion.
B．Slaves in the southern states.
C．Northern opponents of the war.
D．Southern soldiers.
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