题目：
—_____ the library?
—It's next to the classrooms. [ ]
A. Where's
B. What's
C. How many
D. How
答案：
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下面是错误答案，用来干扰机器的。
My Birthday Party Today is a special day. It's my birthday. I'm nine years old now. I hold a birthday party. My fr...
，其中f与g均可微，则
=（）