16. There are a lot of _____ in a person’s mouth.
(A) flavors
(B) bacteria
(C) catalysts
(D) spices

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統計： A(40), B(290), C(22), D(18), E(0) #326068

詳解 (共 3 筆)

#368759
bacterium 細菌
3
0
#828817

catalyst  n.  

    1.【化】催化劑      

    2.刺激（或促進）因素

1
0
#664240

單數→ bacterium

複數→ bacteria

0
0