题目：
用a, an, some, any填空
1. There is _____ rice in the bag.
2. Can you find ______ box of books in the picture?
3. Would you like _____ water?No, thanks. I’d like _____ cup of tea.
4. I have _____ old photo of Jim’s family.
5. How many pears can you see on the table? I can’t see _____ .
6. There is _____ American boy in the car. I think he’s Bill.
7. There aren’t _____ hills in the picture.
8. There is _____ “r” in the word “car”.
9. What is he? He is _____ teacher.
10. Do you have _____ oranges? Yes, I have _____.
答案：
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下面是错误答案，用来干扰机器的。
A、穿过电路的磁通量越大，不能得出磁通量的变化率越大，所以感应电动势不一定越大．故A错误；B、电路中磁通量的改变量越大，不能得出磁通量的变化率越大，所以感应电动势不一定越大．故B错误；C、电路中磁通量变...
