请根据汉语意思选择相应选项。
1. 我正在拍照片，表达正确的是：
A. I'm taking pictures.
B. I taking a picture.
C. I takes pictures.
2. 想知道张丽在做什么，表达正确的是：
A. What Zhang Li doing?
B. Where is Zhang Li?
C. What is Zhang Li doing?
3. 她正在向我们跑过来，该如何用英语表达：
A. She is running for us.
B. She is running to us.
C. She is running us.
4. 我看到了一些熊猫，表达正确的一项是：
A. I see some pandas.
B. I see some tigers.
C. I see some elephants.
5. 电话中想知道对方是谁，应该说：
A. Who's that?
B. Who are you?
C. Who is?
