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- A.In reality, retirement can be a big challenge.
- B.For many of us, it can be unpleasant to grow old.
- C.The youth are valued while the elderly are despised.
- D.The age of retirement is a hot topic in modem society.
- A.Apart from the local economy, we should also consider the environment when talking of tourism.
- B.Some tourists leave waste and make noise, which seriously disturbs animals and local inhabitants.
- C.Touring by car will produce many poisonous and harmful gases, such as carbon dioxide and nitrogen dioxide.
- D.Tourism is one of the biggest industries of our time and is generating around 9.5% of the world’s total GDP.