Beijing is a big city and Shanghai is a big city,too.(保持意思不變

題目：

Beijing is a big city and Shanghai is a big city,too.(保持意思不變)
Beijing is a big city and Shanghai is a big city,too.Beijing is a big city and Shanghai is a big city,too.(保持意思不變)改爲__ __beijing __Shanghai is a big city.

解答：

Not only Beijing but also Shanghai is a big city.
北京和上海都是大城市.