ChaseDream
搜索
返回列表 发新帖
00:00:00

That the application of new technology can increase the productivity of existing coal mines is demonstrated by the case of Tribnia's coal industry. Coal output per miner in Tribnia is double what it was five years ago, even though no new mines have opened.

Which of the following can be properly concluded from the statement about coal output per miner in the passage?

正确答案: A

更多相关帖子

524

帖子

15

好友

4712

积分

ChaseDream

注册时间
2003-03-17
精华
8
解析
查看: 2738|回复: 2
打印 上一主题 下一主题

新Prep-110

[复制链接]
楼主
发表于 2009-8-12 11:55:00 | 只看该作者

新Prep-110

That the application of new technology can increase the productivity of existing coal mines is
demonstrated by the case of Tribnia's coal industry. Coal output per miner in Tribnia is double
what it was five years ago, even though no new mines have opened.
Which of the following can be properly concluded from the statement about coal output per
miner in the passage?
A. If the number of miners working in Tribnian coal mines has remained constant in the past
five years, Tribnia's total coal production has doubled in that period of time.
B. Any individual Tribnian coal mine that achieved an increase in overall output in the past five
years has also experienced an increase in output per miner.
C. If any new coal mines had opened in Tribnia in the past five years, then the increase in
output per miner would have been even greater than it actually was.
D. If any individual Tribnian coal mine has not increased its output per miner in the past five
years, then that mine's overall output has declined or remained constant.
E. In Tribnia the cost of producing a given quantity of coal has declined over the past five years.

为啥答案是A呢?
沙发
发表于 2009-8-12 12:42:00 | 只看该作者

题干 由于新技术,每个矿工的出煤量是五年前的两倍

那么如果矿工数量不变,总量是五年前的两倍

板凳
发表于 2010-9-14 16:22:11 | 只看该作者
能明白A对,
为什么CD不对呢?
您需要登录后才可以回帖 登录 | 立即注册

Mark一下! 看一下! 顶楼主! 感谢分享! 快速回复:

手机版|ChaseDream|GMT+8, 2024-11-9 10:09
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号

ChaseDream 论坛

© 2003-2023 ChaseDream.com. All Rights Reserved.

返回顶部