4. Why does the author mention the city of Philadelphia?
A. Its postal service was inadequate for its population.
B. It was the site of the first post office in the United States. C. It was the largest city in the United States in 1847
D. It was commemorated by the first United States postage stamp.
Bạn đang xem 4. - Đề thi tuyển sinh vào lớp 10 THPT chuyên Anh thành phố Hồ Chí Minh năm 2014