OG4 阅读 Q31

Choice D is the best answer. Gold is a valuable element that commands high prices, so calling something "liquid gold" implies that it has great value. Because the pharmaceutical company GTC was producing the drug in order to sell it, it can be inferred that describing ATryn as "liquid gold" means it proved to be a lucrative product for GTC.
Choices A, B, and C are incorrect because the phrase "liquid gold" does not refer to the microinjection technique, efficiency in dairy production, or transgenic goats being beneficial to dairy farmers.