31. (A)conceals (B)conducts (C)confers (D)conquers

41. (A)These items must meet strict aesthetic and functional requirements to ensure successful mass production. (B)As innovation advances, it continues to generate new solutions for healthier food options, such as dishes with less sugar and more protein. (C)Food printing is not only a significant scientific advancement, but also a topic of debate among chefs. (D)With cutting-edge design tools, this technology has opened up new possibilities in the culinary and healthcare sectors.

31.
(A)conceals
(B)conducts
(C)confers
(D)conquers

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