It took 12 men 4 hours to build a structure. Working at the

题目
单选题
It took 12 men 4 hours to build a structure. Working at the same rate, how many additional men could have been hired in order for the job to have taken 1 hour less?
A

two

B

three

C

four

D

six.

E

eight

参考答案和解析
正确答案: B
解析:
The number of men working and the hours needed for the men to complete the job are inversely related. If x represents the number of additional men needed to complete the job in 3 hours, then 4 ×12=3(12+x), x=4.
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相似问题和答案

第1题:

In the old days my grandpa was made ()12 or 13 hours a day.

A.work

B.worked

C.to work

D.working


参考答案:C

第2题:

In 1999, the government spent about $ 39 billion to ______.

A. improve the prison conditions

B. keep men and women in prison

C. build houses for prisoners

D. maintain the prisons


正确答案:B

38.答案为B。根据第一段最后一句,the cost in 1999 for keeping all these prisoners behind bars is about $39 billion作出该项选择。these prisoners指men and women。

第3题:

It took us more than two hours __ the dinner.

A.prepare

B.preparing

C.to prepare

D.be prepared


参考答案:C

第4题:

To ensure oil purifier working in normal condition, the interval between two sludge discharging should not exceed_______hours.

A.2

B.4

C.5

D.6


正确答案:B

第5题:

Our plane ______at six and landed in Beijing

A. takes off, within four hours

B. took off, four hours later

C. rose up, after four hours

D. raised up, in four hours


正确答案:B
11.答案为B  参考译文:我们的飞机六点钟起飞,四小时后在北京着陆。此题是并列句,前后的时态要一致,都是一般过去时,

第6题:

The author raises the questions in Paragraph 2 to introduce the fact that people____.

A. fail to make full use of their time

B. enjoy working overtime for extra pay

C. are unaware of the law of time

D. welcome flexible working hours


正确答案:C

第7题:

B

Having a husband means an extra seven hours of housework each week for women, according to a new study. For men, getting married saves an hour of housework a week. “It’s a well-known pattern,” said lead researcher Frank Stafford at University of Michigan’s Institute for Social Research. “Men usually work more outside the home, while women take on more of the housework.”

He points out that differences among households(家庭)exist. But in general, marriage means more housework for women and less for men. “And the situation gets worse for women when they have children,” Stafford said.

Overall, times are changing in the American home. In 1976, women busied themselves with 26 weekly hours of sweeping-and-dusting work, compared with 17 hours in 2005. Men are taking on more housework, more than doubling their housework hours from six in 1976 to 13 in 2005.

Single women in their 20s and 30s did the least housework, about 12 weekly hours, while married women in their 60s and 70s did the most-about 21 hours a week.

Men showed a somewhat different pattern, with older men picking up the broom more often than younger men. Single men worked the hardest around the house, more than that of all other age groups of married men.

Having children increases housework even further. With more than three children, for example, wives took on more of the extra work, clocking about 28 hours a week compared with husbands’10 hours.

45. According to the “well-known pattern” in Paragraph 1, a married man___________.

A. takes on heavier work B. does more housework

C. is the main breadwinner D. is the master of the house


正确答案:C

第8题:

It took hours of study before the solution finally __________ him.

A.dawned on

B.relied on

C.taken on

D.impressed on


参考答案:A 解答参考:A dawn(常与on, upon连用) 意为"逐渐被了解;逐渐被感知"例如 The truth at last dawned on him. (最后他开始了解真相。)rely on 意为"依赖, 依靠";take on 意为"呈现, 具有,承担";impress on 意为"给......印象"

第9题:

It took me three hours _______ the task.

A、finishing

B、to finish

C、finish

D、finished


参考答案:B

第10题:

It can be inferred from the last paragraph that _____.

[A] the dream to build interplanetary Internet can be fulfilled in the future

[B] interplanetary Internet will be commercialized in 100 years

[C] the research of Internet took 50 years

[D] it will take a long time to build interplanetary Internet


正确答案:A

本题考查考生的推理引申能力。文章最后一段所做的假设(在今后50年内仅仅是研究项目的东西,在100年后完全有可能商业化)以及与因特网发展历程的比较,都是塞尔夫为了说明建立星际因特网在未来是有可能实现的,所以[A]项正确。文中提到100年只是一种假设,[B]项将其确定为商业化实现的时间,不正确。同样,[C]项将假设中的50年确定为因特网的研究年限,也不正确。该段中塞尔夫的一番话表达了他对星际因特网的建立怀有比较乐观的态度,而不是说明它需要花很长时间才能实现,[D]项不正确。

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