【简答题】(Passage 2, Lines 1-3, Para. 3) Them we fed them four unidentified samples of cola on at a time, regular colas for the one group, diet versions for the other.
【简答题】Questions 15 to 17 are based on the following passage. At the end o f the passage, you will be given 15 seconds to answer the questions. Now, listen. to the passage. In 1847 most countries of the worl...