【单选题】Are organically grown foods the best food choices? The advantages claimed for such foods over conventionally grown and marketed food products are now being debated. Advocates of organic foods frequent...
A.
organic goods can be more expensive but are often no better than conventionally grown foods
B.
many organic foods are actually less nutritious than similar conventionally grown foods
C.
conventionally grown foods are more readily available than organic foods
D.
too many farmers will stop using conventional methods to grow food crops
【单选题】For more than 70 years, scientists have known that animals such as dogs and mice show increased longevity with decreased food intake. In other words, mice fed 40 percent fewer calories than what is co...