We had an awful school trip last week. Some students were late. Then we waited half an hour for the school bus, but it didn't arrive. Finally, our teacher took us to take the subway. It took over an hour. Then we walked a long way. When we arrived at the zoo, it was already 12:00. We were all tired and hungry. We wanted to see pandas, but there weren't any. There were some really smart dolphin（海豚）,but we didn't see the show because we arrived too late. We forgot our cameras, so we couldn't take any photos. Then it started to rain, and no one had an umbrella. We didn't see many animals because of the rain. So we went for lunch. We ate hamburgers. My friends also had some ice-cream. But I didn't have any, because I don't like it. I wanted French fries, but there weren't any in the shop. They were sold out! Finally we went back to school. We were wet, tired and stressed out. I didn't enjoy my school trip at all.

$\sqrt{\frac{6}{64}}$ =____，

$\sqrt[3]{\frac{61}{125}-1}$ =____，

（2+ $\sqrt{3}$ ）（2﹣ $\sqrt{3}$ ）=____．

秦岭—淮河线南北两侧的地理差异明显，下列关于这种差异的叙述错误的是（    ）