单项选择题
How many children's museums have been set up in America in the past 15 years
A) About 100. C) Over 180.
B) Less than 80. D) Altogether 215.
A．How many children's museums have been set up in America in the past 15 years
B．About 100.
C．Less than 80.
D．Over 180.
E．Altogether 215.