B错误，人名混用

原文： Investments in service, like those in production and distribution, must be balanced against other types of investments on the basis of direct, tangible benefits such as cost reduction and increased revenues.

A、B同时出现，一定不对，选C，basis，E 没有competitive优势

A：前半部分对，后半部分错

make it possible for sb to do sth
make it possible to do sth

除了分析方案推理的答案必须涉及方案内容，D还有个很严重的错误就是，T大气污染最严重的不是汽车排放而是电厂，那如果汽车是第二严重的呢？只要汽车排放会造成污染，那么这个方案便是能够达到目的，所以D完全没有回答问题中的问题！

examples:
laws specifying long jail sentences for drunk drivers --> correct (___ing), since that's what the laws actually specify.
laws to specify long jail sentences for drunk drivers --> incorrect (that's not the ultimate purpose of the laws)
laws to discourage drunk driving --> correct (this IS actually the ultimate purpose of the laws)

脑子秀逗了，一看到saving和cost没仔细看就选了，saving＜cost，利润还是减少；saving＞cost，利润才能增加。

抓住题干是问能不能提高sales，所以答案一定要涉及sales，然后只剩DE，D很容易看出来是错的

设Cost=a*l^2*t

这个文段里有两个strategy. 第一个是售价比市场能够承受的最高价格少（boldface部分），第二个是市面上公司的先行做法，就是把定价定到市场的最高价格。第二个Boldface削弱的是后面现行的做法。所以选A。

C选项-A surge in new home sales and a drop in weekly unemployment claims suggest
that the economy might not be as weak as have been previously thought by some analysts
that从句还原后the economy might not be as weak as economy have been previously thought by some analysts
have应用has

答案A是干扰项，看起来很有效的解释为什么月亮上没有life，但是根据题干，我们要解释的问题不单纯是为什么月亮上没有life，而是为什么地球上有life而月亮上没有，所以是正确答案一定要包含comparison between earth and moon.

请问这里DE 选项中的unlike没有问题吗

do so 指代句子，mark

film的法案和video game类比。找film 和video的不同点

The problem here is the awkward placement of the phrase - the eruption of Vesuvius in two letters, - giving the feeling that the eruption took place in two letters; on this count, the A and D can be eliminated.
B has the untouchable participle – being - ; in addition - the only eyewitness accounts - should be - the only eyewitness account-
C. - nephew of Pliny the Elder writing to – as if he is just now writing. Wrong diction
E is the best, bringing out in simple terms the intended meaning

if不能表示是否，排除d e，b没必要倒装排除

请问为什么不可以是this，it 代指前面整件事情呢，代指前面整个句子不可以吗

果因推理