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.______
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