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【简答题】

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Every object tells a story. Even the most ordinary objects can present to us powerful images.
Sometimes it is the ordinary nature of these objects that actually makes them so extraordinary.
Such is the case with an old leather shoe in a museum in Alaska. At first glance it does not look like
much. It is a woman's shoe of a style popular in the 1890s. But what is unique(独特的) about this
shoe is where it was found. It was discovered on the Checkout Pass, the famous trail used by the
people seeking gold in Alaska. Who it belonged to or why it was left there is not known. Was it
perhaps dropped by accident as the woman climbed up the 1500 stairs carved outface? Or did she
throw away goods that she didn't need in order to travel lighter?
Over 100, 000 people with 'gold fever' made this trip hoping to become millionaires. Few of
them understood that on their way they would have to cross a harsh wildness. Unprepared for such
a erous journey, many died of starvation and exposure to the cold weather.
The Canadian government finally started requiring the gold seekers to bring one ton of supplies
with them. This was thought to be enough for a person to survive for one year. They would carry
their supplies in backpacks(背包) each weighing up to fifty pounds; it usually took at least 40 trips
to get everything to the top and over the pass. Whoever dropped the shoe must have been a brave
and determined woman. Perhaps she was successful and made it to Alaska. Perhaps she had to turn
back in defeat. No one will ever know for sure, but what we do know is that she took part in one of
the greatest adventures in the 19th century.

1. Which of the following is right?

A. it was found on a famous trail
B. it was an important clue to life in the past
C. it at one time belonged to a VIP
D. it was a fashionable shoe at that time

2. According to this passage, many people who went to Alaska _______.

A. ually became millionaires
B. were not properly equipped
C. were very poor
D. brought with them many shoes

3. The Canadian government made gold seekers bring one year's supplies with them so that ___.

A. they would not die of hunger and cold
B. the army would have enough food for fighting a war
C. they would change these goods with the Eskimos
D. the supplies would make Alaska rich

4. No matter what happened to the woman who owned the shoe, _______.

A. she must have been a brave woman.
B. she certainly dropped the shoe on purpose
C. her adventurous spirit is definitely admired
D. her other shoes were equally fashionable

5. what's the best title of the passage?

A. special shoe whose ower is a woman.
B. the sad story about the shoe.
C. the old shoe that has a special. story.
D. gold seekers

题目标签:背包
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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】户外旅行背包的颜色划分,代表装东西时()。

A.
从下到上,越来越重
B.
从下到上,越来越轻
C.
颜色越浅,重量越重
D.
颜色越深,重量越重

【单选题】在户外最常用的背包上肩的方法是( )。

A.
高处上肩法
B.
提拉上肩法
C.
弓步上肩法
D.
下蹲上肩法

【单选题】完全背包的状态转移方程是()

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])