在线等！问2道PREP破解版的逻辑题

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Which of the following most logically completes the argument?

United States manufacturers currently produce most of the world's solar-power generators--most of which are exported to Europe.  However, European manufacturers are emerging and probably will ultimately capture much of the European market.  The United States government is funding initiatives intended to encourage use of solar power within the United States.  If these initiatives succeed in increasing the demand for solar-power generators in the United States, United States manufacturers will probably maintain significant production levels, since _.

(A) some United States manufacturers have been substantially increasing their output over the last several years

(B) the efficiency of solar-power generators in converting energy from the Sun into electric power is not improving as fast as it once did

(C) just as European manufacturers enjoy certain competitive advantages in Europe, so do United States manufacturers in the United States

(D) European governments are currently undertaking initiatives to stimulate the use of solar power within Europe

(E) the current market for solar-power generators in the United States is very limited

答案选C, 我选E。

Archaeologists in Michigan have excavated a Native American camp near Dumaw Creek.  Radiocarbon dating of animal bones found at the site indicates that the camp dates from some time between 1605 and 1755.  However, the camp probably dates to no later than 1630, since no European trade goods were found at the site, and European traders were active in the region from the 1620's onward.

Which of the following, if true, most strengthens the argument? C B

(A) Due to trade among Native Americans, some European trade goods would have reached the area before the European traders themselves did.

(B) At all camps in the region that have been reliably dated to the late 1620's, remains of European trade goods have been found.

(C) The first European trade goods to reach the area would have been considered especially valuable and preserved as much as possible from loss or destruction.

(D) The first European traders in the area followed soon after the first European explorers.

(E) The site is that of a temporary camp that would have been used seasonally for a few years and then abandoned.

答案选B， 我选C。

1、the current market for solar-power generators in the United States is very limited这一条件无论是否存在，都不能影响 If these initiatives succeed in increasing the demand for solar-power generators in the United States, United States manufacturers will probably maintain significant production levels这一结论，只要创新能succed in increasing the demand，现在市场的状况是饱和还是有限又有何关系呢。B不同，它弥补了一个GAP，如果市场需求增大，但是美国本土市场不像欧洲市场那样倾向购买本土产品，这也是白搭，有可能更多的市场需求都去购买欧洲的产品去了。

2、开始对1620's onward的理解太肤浅了。stimulus说预测某个遗址起始于1605-1755，但有新证据表明，它应该在1630年前就结束了，因为没有发现trade goods，trade在1620‘s期间就开始活跃了。（注意，1630和1620’s之间的关系有些绕，因为trade在1620’s这段时间内不是同时开始活跃的而是陆续开始的，这样到late 1620's可能仍然有一部分camp是没有开始trade,作者的意思在于从1630年开始，所有的camp都已经有camp所以如果发现trade goods必然是1630 以后的camp。）

B说准确定位到late 1620's那些camp都有发现trade goods，换言之，late 1620's已经十分普遍，进一步加强了作者所认为的1630以后所有的camp都有trade的论断。

C说trade goods 有可能因为珍贵而preserved as much as possible from loss or destruction，我仍然觉得这是一个暗示，trade goods出现不代表它属于当时，可能是更久远以前遗留下来的，所以用它来date不准确。但这样的假设对于“（有因有果）没有发现trade good-〉在1630前结束或者是（无果无因）在1630年后结束-〉可以发现trade goods”这两个论断来说是没有支持作用的。