The milk comes from the cow 这句话是对的." 这个牛奶产自那头奶牛".
也可以说:Milk comes from cow .牛奶产自奶牛.
The West Lake is in Hangzhou .也是对的."西湖在杭州."
另外两句错了.应改为:
The pear is smaller than the watermelon.
梨子比西瓜小.
KFC is not good for our health./KFC is bad for our health.
肯德基对健康不利.