GRE Reading Comprehension: ETS Official Practice 150-GRE OP150: 阅读 - TRQ48SGLCFR5IJK7Z

The passage implies which of the following about the problems ragwort poses to dairy farmers? A. Milk produced by cows that eat ragwort causes illness in humans who drink it. B. Ragwort can supplant the plants normally eaten by cattle. C. Cattle, unlike sheep, are unable to differentiate between ragwort and healthy grazing.