【答案】DCD
【文章大意】新加坡是一个多元化的城市，在那里，你会发现不同的文化、饮食、艺术、民族和建筑完美地融合在一起。如果在登机之前，你有5小时以上的空闲时间，那么，请加入我们两小时的新加坡免费之旅吧。
21【解析】细节理解题。根据第一段“Registration for the tour must be made at least one hour before the start of the tour.”可知，需要提前一个小时登记，现在是下午2:30，4:00-6:00那一趟的预约登记时间是3:00，这个时间段最适合Mike，故选D。
22【解析】细节理解题。根据第二段“The journey to the Merlion Park offers you a entire view of Singapore's landmarks like Marina Bay Sands, Singapore Flyer and Gardens by the Bay.”可知，游客可以在Merlion Park欣赏到新加坡地标性建筑，故选C。
23【解析】细节理解题。根据最后一段“Next, you will see the Helix(螺旋的) Bridge which is inspired by the double helix of our DNA structure.”可知，参加City Light Tour的游客会看到螺旋大桥，故选D。
B
Why do Americans struggle with watching their weight, while the French, who consume rich food, continue to stay thin? Now a research by Cornell University suggests how life style and decisions about eating may affect weight. Researchers concluded that the French tend to stop eating when they feel full. However, Americans tend
