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Synthetic pigments are unsafe. ( )

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Due to the existence of intermolecular hydrogen bonds in the molecules of bitter substances, the hydrophobicity of the molecules is increased and it is easier to adsorb on the taste buds, so we are more sensitive to the feeling of bitterness. ( )

Taste can also be sensed on the back of the tongue. ( )

The color we seen by the eye is the color of complementary light after the pigment absorbs light waves. ( )

The root of the tongue is sensitive to bitterness.( )