OG-136, OG-153

baby11

OG136,153, OG的解释没太看明白., 还请xdjm们指教一下!
136.问题
这道题是否要联想的太多了: 杂志的主要收入是来源于广告,而不是别的. 为什么没有考虑少发行一半,也要少赚一半的钱呢, (这个好像是很明显的一个考虑因素).? 还是说都是免费的, 只有广告收入?
136. Because postage rates are rising, Home Decorator magazine plans to maximize its profits by reducing by one half the number of issues it publishes each year. The quality of articles, the number of articles published per year, and the subscription price will not change. Market research shows that neither subscribers nor advertisers will be lost if the magazine's plan is instituted.
Which of the following, if true, provides the strongest evidence that the magazine's profits are likely to decline if the plan is instituted?
(A) With the new postage rates, a typical issue under the proposed plan would cost about one-third more to mail than a typical current issue would.
(B) The majority of the magazine's subscribers are less concerned about a possible
reduction in the quantity of the magazine's articles than about a possible loss of the
current high quality of its articles.
(C) Many of the magazine's long-time subscribers would continue their subscriptions even
if the subscription price were increased.
(D) Most of the advertisers that purchase advertising space in the magazine will continue to
spend the same amount on advertising per issue as they have in the past.
(E) Production costs for the magazine are expected to remain stable.

153: 问题
A为什么不能算在cost-efficiency里面? 是定义嘛? 原油的成本为什么就不算在cost-efficiency里面了? 既然太阳能工厂的cost里面考虑了equipment cost!

153. Technological improvements and reduced equipment costs have made converting solar
energy directly into electricity far more cost-efficient in the last decade. However, the threshold
of economic viability for solar power (that is, the price per barrel to which oil would have to rise
in order for new solar power plants to be more economical than new oil-fired power plants) is
unchanged at thirty-five dollars.
Which of the following, if true, does most to help explain why the increased cost-efficiency
of solar power has not decreased its threshold of economic viability?
(A) The cost of oil has fallen dramatically.
(B) The reduction in the cost of solar-power equipment has occurred despite increased
raw material costs for that equipment.
(C) Technological changes have increased the efficiency of oil-fired power plants.
(D) Most electricity is generated by coal-fired or nuclear, rather than oil-fired, power plants.
(E) When the price of oil increases, reserves of oil not previously worth exploiting become
economically viable.

topway7

1.the argument has excluded all other factors rather than the income of the ad.,which is the key factor for the income's declining.
2. threhold keeps stable means the cost of the solar power plants remains stable.since the equipment's cost is reduced,what can make the cost of plants stable? then,the raw material costs appear.  attention:here the threhold refers to the increased price,not the price difference.

wretdgdh

答案分别是D和C，对否？