VOA一分鐘英語：怎樣區(qū)分 what 和 which？

英語疑問詞 “what” 和 “which” 用來引導問句，但由它們引導的問句之間有一個根本的區(qū)別。哪一個詞用來引導有選擇的疑問句？哪一個詞引導的問句，其答案不受任何限制？
 
文字稿
Hello again, everyone. Tom here for BBC Learning English. Today, I'm going to explain the difference between what and which in questions.
What is used to ask a question which has a lot of possible answers. Consider the question: What do you want to eat for lunch? Here, there are no choices to limit your reply. You could choose anything you want.
We use which when we have options to choose from. So, here we have two choices – a sandwich and a melon. So I can say: Which do you want to eat? The sandwich or the melon?
Now, next time you need to ask a question, you'll know which word to use. What for anything and which when you have a choice.
 
用法總結
怎樣區(qū)分 what 和 which?
1 What is used to ask a question which has a lot of possible answers.
用 “what” 引導的疑問句的回答沒有限制，有很多種可能。What do you want to eat for lunch?
Here, there are no choices to limit your reply. You could choose anything you want.
這個問題的回答沒有限制，可以根據(jù)自己的喜好作答。
 
2 We use which when we have options to choose from.
當提問有選擇時，用 “which” 引導疑問句。
So, here we have two choices – a sandwich and a melon. So I can say:
比如：我有兩個選擇，選擇一：三明治，選擇二：瓜 。這時就可以問：
Which do you want to eat? The sandwich or the melon?