The root of the tongue is sensitive to bitterness.( )
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Which of the following pigments is not a synthetic pigment? ( )
A. Indigo
B. Sunset yellow
C. Beet red
D. Amaranth
Which of the following olfactory substances does not belong to terpenes? ( )
A. α-terpinene
B. 2-trans-hexenal
C. Thymol, longifolene
D. Pigeritone
Which of the following characteristic odors is formed through chemical reactions without enzymes? ( )
A. The pungent smell of garlic seedlings
B. The fragrance of lemon
C. Fishy smell
D. The aroma of toast
The following substances put together will produce the counteraction and weakening effect of the sense of taste is ( ).
Add cube sugar to black coffee
B. Add acesulfame to sugar-free coke
C. Add MSG to the chicken broth
D. Sprinkle salt on toasted buns