people in America like eating hamburger with b____ in it.
问题描述：
people in America like eating hamburger with b____ in it.
答
people in America like eating hamburger with （beef）in it.
用beef 牛肉。hamburger with beef in it 就是指夹牛肉的汉堡包。
最早的汉堡包就是两片圆面包夹块牛肉饼。所以用beef就行了。
答
butter奶油
美国人喜欢吃夹着奶油的蛋糕。
答
people in America like eating hamburger with butter in it.