（2016高考阅读理解）阅读下列短文，从每题所给的选项中选出最佳选项。
Americans think that travel is good for you.Some even think it can help with one of the country’s worst problemscrime(犯罪)．Crime worries a lot of people.Every year，the number of crimes is up and up.And many criminals are young.They often come from sad homes，with only one parent or no parents at all.
