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.
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