题目：
阅读小天地：读一读，选一选。
It's Tuesday afternoon. Jenny is going to the train station to buy tickets. She and her mother are going on
a trip to Xi'an on Thursday.
" How much for a ticket from Beijing to Xi'an? " Jenny asks. " 120 yuan," the clerk answers.
Now Jenny has two tickets. The train leaves at 2: 15 in the afternoon. It arrives in Xi'an at 4: 00 in the
morning. Jenny is excited (激动的). She runs home.
1. Jenny buys the tickets on ____________.
A. Monday
B. Tuesday
C. Thursday
2. How much for the two tickets?
A. 120 yuan
B. 200 yuan
C. 240 yuan
3. Jenny and her mother want to go to ____________.
A. Xi'an
B. Beijing
C. Nanjing
4. When does the train leave?
A. At 2: 15 in the morning.
B. At 4: 00 in the morning.
C. At 2: 15 in the afternoon.
5. How does Jenny feel now?
A. She is sad.
B. She is excited.
C. We don't know.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：时间解析： 算法的复杂度主要指时间复杂度和空间复杂度。所谓算法的时间复杂度，是指执行算法所需要的计算工作量；算法的空间复杂度，一般是指执行这个算法所需要的内存空间规模。
