A. As an example of complex substances having not been duplicated satisfactorily.
B. Because the coffee fragrance is hard to produce.
C. To conclude the passage.
D. The smell of fresh coffee is inviting.wｗw.ExamＷ.CoM
77. ______ a substance can be synthesized.
A. Upon identifying the basic components of it
B. Once chemically analyzed
C. When gas chromatography is used
D. If spectroscopy is adopted
78. It can be inferred from the passage that ______
A. vanillin is easier to synthesize than benzaldehyde
B. not all synthetic flavors are harmless
C. in general, the less components there are in a fragrance, the harder it is to synthesize
D. synthesized substances must be tested for safety only if they are used in food
79. Which of the following is the best title for tile passage?
A. How to Synthesize Fragrances
B. Synthetic Substances Are Easy to Make
C. Natural Flavorings and Fragrances
D. Synthetic Flavors and Fragrances
80. Which of the following is NOT true according to the last paragraph?
A. Synthetic fragrances can be used to make a used car smell like a new one.
B. Synthetic flavors and fragrances have added to the varieties of products.
C. Lemon soap is made out of some delicious lemon.考试用书
D. It is likely that a bottle of orange juice is synthesized.
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