The author mentions big cities such as Tokyo, Singapore and Paris______.
A. to show that city people all over the world have a lot in common
B. to let his readers be aware that they are some of the world’s biggest cities
C. to illustrate their difference from American cities
D. because they are some of the cities that attract visitors most
正确答案：A
44．答案为A从第三段第一句可知国际上的大城市有很多共同之处A正确
