【简答题】阅读理解。 Ann loves the underground (地铁) in London. She always prefers to travel on the underground because it is fast. She doesn't find it difficult now, as she has got used to (逐渐习惯) it. Ann knows the u...
【简答题】27 Air pollution can be as harmful to one's health___________ 28 Traveling on an underground train can reduce exposure___________ 29 Pollution levels are lower__________ 30 It's wise to stay away from...