两道PREP2的题，帮忙解答一下，谢谢

huangxiuying

4.    (24257-!-item-!-188;#058&001200)

 

Which of the following most logically completes the argument?(A)

 

A new machine for harvesting corn will allow rows to be planted only fifteen inches apart, instead of the usual thirty inches.  Corn planted this closely will produce lower yields per plant.  Nevertheless, the new machine will allow corn growers to double their profits per acre because __________.

 

(A) with the closer spacing of the rows, the growing corn plants will quickly form a dense canopy of leaves, which will, by shading the ground, minimize the need for costly weed control and irrigation

(B) with the closer spacing of the rows, corn plants will be forced to grow taller because of increased competition for sunlight from neighboring corn plants

(C) with the larger number of plants growing per acre, more fertilizer will be required

(D) with the spacing between rows cut by half, the number of plants grown per acre will almost double

(E) with the closer spacing of the rows, the acreage on which corn is planted will be utilized much more intensively than it was before, requiring more frequent fallow years in which corn

这一题我开始选的D,由于每株植物产量下降，植物数增加到接近二倍，所以利润应该小于两倍，D错，这样理解是否正确？

11.   (24915-!-item-!-188;#058&001837)

 

Radio stations with radio data system (RDS) technology broadcast special program information that only radios with an RDS feature can receive.  Between 1994 and 1996, the number of RDS radio stations in Verdland increased from 250 to 600.  However, since the number of RDS-equipped radios in Verdland was about the same in 1996 as in 1994, the number of Verdlanders receiving the special program information probably did not increase significantly.

 

Which of the following is an assumption on which the argument depends?（A）

 

(A) Few if any of the RDS radio stations that began broadcasting in Verdland after 1994 broadcast to people with RDS-equipped radios living in areas not previously reached by RDS stations.

(B) In 1996 most Verdlanders who lived within the listening area of an RDS station already had a radio equipped to receive RDS.

(C) Equipping a radio station with RDS technology does not decrease the station's listening area.

(D) In 1996 Verdlanders who did not own radios equipped to receive RDS could not receive any programming from the RDS radio stations that began broadcasting in Verdland after 1994.

(E) The RDS radio stations in Verdland in 1996 did not all offer the same type of programming.

A没看懂是什么意思，能解释一下吗？谢谢

maggiecookies

4. 你的理解是对的, 这题我也错过, 你当数学问题理解就好啦.

11. 这个我也做错啦, 这个答案不是一般的阴...我被一堆radio 弄混拉.

    意思是, (很少) 有安装了RDS-equipped radios接收不到radio( 频道,节目...), 就是说安装了就可以收到. ---排除它因.

[此贴子已经被作者于2008-7-27 18:32:22编辑过]

huangxiuying

LS的MM实在是大好人，谢谢

candy-jing

第一题的理解我觉得可以从逻辑本身来看，文中说row之间的距离简短了，可能导致产量的增加，后来又说其实profit会增加。所以只有a 很好的把这两部分的信息连接在一起。说距离短了可以产生华盖可以减低能耗。 非常完美的答案。

huangxiuying

谢谢LS的MM，逻辑的做题一定从逻辑链入手是我的最大感悟