新Prep-110

falconcn

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？

bubumouse

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

jessiecg

能明白A对，
为什么CD不对呢？