题目：
Here are the twin sisters, Lily and Lucy. They are in Miss Gao’s class. They are two new students. They’re eleven. This is their room. It’s a nice room. There are two beds in the room. One is Lucy’s and the other is Lily’s. They look the same. Their coats are on their beds. We can’t see their shoes. They’re under their beds.
The twins have two desks and chairs. Their clocks, books and pencil boxes are on the desks. Their schoolbags are behind the chairs.
根据短文内容，选择最佳答案。
小题1: What kind(种类) of room is it?
A．It’s a classroom.
B．It’s a bedroom.
C．It’s a big room.
D．It’s a nice room.小题2:Which one is NOT TRUE?
A．Lily’s coat is on her bed.
B．Lucy’s shoes are under her chair.
C．There are two beds in the room.
D．They are students.小题3: Lucy and Lily are _____________.
A．women
B．sons
C．sisters
D．brothers小题4:Where are their books?
A．On the desks.
B．In the beds.
C．Under the beds.
D．Behind the chairs.
答案：
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下面是错误答案，用来干扰机器的。
解：（1）因为是函数的极值点所以即因此经检验，当时，是函数的极值点；（2）由题设当在区间上的最大值为时即故得反之，当时，对任意而，故在区间上的最大值为综上，a的取值范围为。
