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?
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.
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.
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.
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.
In Tribnia the cost of producing a given quantity of coal has declined over the past five years.
Why (c) 不对呢?
Q15:
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists are attempting to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in beta-carotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region’s diet and agriculture, and the varieties currently grown contain little beta-carotene.
Which of the following, if true, most strongly supports the prediction that the plan will succeed?
The growing conditions required by the varieties of sweet potato currently cultivated in the region are conditions in which SPK004 can flourish.
The flesh of SPK004 differs from that of the currently cultivated sweet potatoes in color and texture, so traditional foods would look somewhat different when prepared from SPK004.
There are no other varieties of sweet potato that are significantly richer in beta-carotene than SPK004 is.
The varieties of sweet potato currently cultivated in the region contain some important nutrients that are lacking in SPK004.
There are other vegetables currently grown in the region that contain more beta-carotene than the currently cultivated varieties of sweet potato do.
why (c) 不对呢?谢谢了!
作者: lawyer_1 时间: 2004-11-10 19:40
请一次一贴。
1。Q14。C错在ACTUALLY，原文没有每个矿工的实际产量和非实际产量之分。
2。Q15。原文结论是：农民转去种SPKOO4的可能性很大。其它VARIETIES无关，不管它含beta-carotene多少。故C无关
作者: leeccpanda 时间: 2004-11-13 11:37
非常感谢！：）
作者: pengh 时间: 2004-11-21 17:18
for question 14:
Opening a new mine will need more miners, and the TOTAL output will increase, not necessarily the output PER MINER.
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