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【简答题】

完形填空。 Let's have a look at American students' school life. On school days, American students usually __ 1 __ up at 7:00 am. Most students walk or __ 2 __ a yellow school bus to school. Very __3 __ students ride bikes. __ 4 __ they arrive at school at about 8:30 am, they meet their friends and __ 5__ about their activities. They put their backpack (背包) in a small cupboard (衣柜) and take out only one book, some writing paper and a pencil __ 6 __ each class. In the middle school, they learn many subjects. At __ 7 __ , the students eat lunch at school. They usually have meat, vegetables, fruit and some drinks. __ 8 __, some students prefer pizza, hot dogs or hamburgers. After __ 9 __, they continue(继续) to have classes until 3:00 pm and then they go back _ 10 __ . (     )1. A. get (     )2. A. carry (     )3. A. little (     )4. A. Before (     )5. A. talk (     )6. A. in (     )7. A. morning (     )8. A. However (     )9. A. class (     )10. A. school B. stand B. bring B. much B. When B. say B. on B. evening B. So B. school B. to home C. sit C. take C. many C. Then C. listen C. of C. noon C. Sure C. breakfast C. home D. put D. get D. few D. So D. hear D. with D. afternoon D. Then D. lunch D. to school

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题目标签:衣柜背包
参考答案:
参考解析:
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【单选题】01背包的一维状态转移方程是(i表示物品编号,j表示背包容量)

A.
dp[i] = max(dp[j], dp[j-w[i]]+v[i])
B.
dp[j] = max(dp[i], dp[j-w[i]]+v[i])
C.
dp[j] = max(dp[j], dp[j-w[i]]+v[i])
D.
dp[j] = max(dp[j], dp[j-w[j]]+v[j])

【单选题】衣柜的深度通常是

A.
450~550mm
B.
550~600mm
C.
600~650mm
D.
450~600mm