本期重点： 平行结构
平行结构错误主要指在并列连接词and前后语法结构不对等、不平行。其它并列连词还有but, as well as, or, or else, both … and, neither … nor, either … or, not only … but (also)等可连接两个对等的词和对等的结构。
考点例析
1：Computeranalyzed marketing reports can help deciding
which products to emphasize now,which to develop for
the future, and which to be dropped. ____________
解析：本句中三个平行成份which products to emphasize now, which to develop和which to be dropped结构模式应该一致，均采用不定式主动语态，因而to be dropped应改为to drop。（注：在四六级考试中，短文改错只能修改、删除或添加一个单词，不能同时改动两个。本例题旨在反映平行结构的语法性质。）
例2：At the heart of the NEA survey is the belief that our
democratic System depends on leaders who can think
critically, analyze texts and writing clearly. ___________
解析：can后面有三个并列的谓语动词，因此writing应改成与think, analyze并列的动词原形write。
例3：Atrophy is a decrease in size of a cell, organ, tissues, or other part of the body. _______
解析;：并列连词or连接四项名词结构，其中cell 和organ皆为单数形式，故tissues应改为单数tissue。
巩固与拓展
1．A majority of the reports received from people claiming
to have seen the lengendaiy Loch Ness monster have
proven to be mistakes, misconceptions, or tricked. ___________
2. Your semester grade is based not only on how well you
do on each test, but also how you participate in class. ___________
3. Modern sience was born when Galileo began trying to explain
how things happen and thus originating the method of controlled __________
experiment which now forms the basis of scientific investigation
4. Restrict your self to one or two pages, and listing ___________
any publications or referees on a separate sheet.
5. The House proposal would have barred the federal
government from demanding library records, read lists, __________
book customer lists and other material in terrorism and
intelligence investigations.
综合改错
The biggest safety threat facing airlines today may not be a terrorist
With a gun, than the man with the portable computer in business class. 1._____
In the last 15 years, pilots report well over 100 incidents tha could 2. _____
have been caused by electromagnetic interference. The source of this
interference remains confirmed, but increasingly, experts are pointing the 3._____
blame at portable electronic devices such as portable computers, radio and 4. _____
cassette players and mobile telephones.
RTCA, an organization advertises the aviation industry, has 5. ______
recommended that the airline bans such devices from 6.______
used during “critical” stages of lignt, particularly take-off and landing. 7._______
Some experts have gone further, calling for a total ban during all flights.
Currently, rules on using these devices are left up to individual airlines.
And although some airlines prohibit passengers from using such equipment
during take-off and landing, most are willing to enforce a total ban, given 8. ______
that many pasengers want to work during flights.
The difficulty is predicting how electromagnetic fields may affect an
aircraft’s computers. Experts know that portable devices emit radiation
which affect those wavelength which craft use for navigation and 9.______
communication. But , because they have not been able to reproduce
these effects in a laboratory, they have no way of knowing
whether the interference might be danger or not. 10.______
巩固与拓展
1. tricked -> tricks
并列连词or连接三项成分。前两项均为名词，故tricked应改为名词tricks与前面的mistakes和misconceptions平行。
2. how前加on
3. originating -> originated
And后面的thus说明并列句的第二部分是和前面的began对应，而非与trying对应。
4. listing -> list
这句是祈使句，list与前面的restrict并列。
5. read -> reading
[决战六级 短文改错] [第廿期] [平行结构] [已奖励]
综合练习
1. than -> but
此处为固定句式not…but…，此句大意为“最大的飞行隐患不是持枪的恐怖分子，而是商务舱中携带手提电脑的人。”
2. report-> reported
该句子的时间状语是In the last 15 years表明其基本时态是一般过去时。
3. confirmed -> unconfirmed
根据上下文，电脑对飞机影响的原因还不大清楚，故使用unconfirmed。
4. radio -> radios
5. organization后加which
本句主语是RTCA，谓语是has recommended，中间的an organization advertises the aviation industry是RTCA的同位语，所以advertises the aviation industry应该是做定语修饰organization。故在organization后加which。
6. bans -> ban
recommend后面的宾语从句要使用虚拟语气，形式为(should) + v，should可省略。
7. used前加being
From是介词，后面不能直接使用过去分词used，如果要表示相同的意思，要是用动名词形式才行。又因为devices与use之间是被动关系，所以应该加上being。
8. willing -> unwilling / reluctant或在willing前加not
此句的正确意思是：尽管一些航空公司禁止乘客在飞机起飞和着陆时使用那些电子产品，但由于许多乘客很想在飞行时继续办公，所以很多航空公司也不愿意彻底实施禁令。
9.affect -> affects
定语从句先行词radiation是单数，从句的谓语动词也要用单数。
10. danger -> dangerous