问题补充：
The lowest price of the new iPad in the USA is dollars.
A. three hundreds and ninety-nine
B. three hundred and ninety-nine
C. three hundred ninety-nine
D. three hundreds ninety-nine
答案：
A. three hundreds and ninety-nine
(答案→)B. three hundred and ninety-nine
C. three hundred ninety-nine
D. three hundreds ninety-nine
解析：句意：新的ipad的最低价格是399。具体数字不加s，个位和十位之间有连字符，百位和十位之间加and。故选B
