单项选择题
A．All senses have their limitations. B．Insects are more sensitive to colours than man. C．Man has not fully utilized all his senses. D．Man is not as good as animals in learning about the environment.
A．skins that are quick to feel and respond B．skins that are delicate C．skins that are completely dry D．skins that are sticky or slippery
A．Some cultures favor the past time. B．Some cultures have the tendency to favor the present time. C．Some cultures tend to favor the future time. D．All of the above.