下列各项中翻译不恰当的一项是：（）
A．或取诸怀抱，悟言一室之内；或因寄所托，放浪形骸之外。
或者倾吐襟怀抱负，在一室之内交谈；或者借其外物寄托自己的情怀，自由放纵的生活。
B．况修短随化，终期于尽！
更何况人的一生长短取决于造化，而最终注定要消亡呢！
C．固知一死生为虚诞，齐彭殇为妄作。
本来就知道把死和生混为一谈是虚诞的，把长寿与夭亡等量齐观是荒谬的
D．后之览者，亦将有感于斯文。后来的读者，恐怕也将对这些诗文生发同样的感慨吧。
答案：A
有时倾吐襟怀抱负，在一室之内交谈；有时借其外物寄托自己的情怀，自由放纵的生活。
| Natural flavorings and fragrances are often costly and limited in supply. For example, the vital ingredient in a rose fragrance is extracted from natural rose oil at a cost of thousands of dollars a pound; an identical synthetic substance can be made for 1% of this cost. Since the early twentieth century, success in reproducing these substances has created a new industry that today produces hundreds of artificial flavors and fragrances. Some natural fragrances are easily synthesized; these include vanillin, the aromatic ingredient in vanilla, and benzaldehyde, the aromatic ingredient in wild cherries. Other fragrances, however, have dozens, even hundreds of components. Only recently has it been possible to separate and identify these ingredients by the use of gas chromatography and spectroscopy. Once the chemical identity is known, it is often possible to synthesize them. Nevertheless, some complex substances, such as the aroma of fresh coffee, have still not been duplicated satisfactorily. Many of the chemical compounds making up these synthetics are identical to those found in nature, and are as harmless or harmful as the natural substances. New products must be tested for safety, and when used in food, must be approved by the U.S. Food and Drug Administration. The availability of synthetic flavors and fragrances has made possible a large variety of products, from inexpensive beverages to perfumed soap to used cars with applied "new car odor." |
______, 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