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题库 / Prep2007E1-SC-121
When the temperature of a gas is increased, it is either accompanied by an increase in pressure if the gas is enclosed in a container, or an increase in volume if the gas is able to expand.
When the temperature of a gas is increased, it is either accompanied by an increase in pressure if the gas is enclosed in a container, or
When the temperature of a gas is increased, it is accompanied either by an increase in pressure if it is enclosed in a container or
When the temperature of a gas is increased, the increase is either accompanied by an increase in pressure if the gas is enclosed in a container or by
Any increase in the temperature of a gas is either accompanied by an increase in pressure if it is enclosed in a container, or by
Any increase in the temperature of a gas is accompanied either by an increase in pressure if the gas is enclosed in a container or by
either……or……之间平行几乎可以排除ALL WRONG
AB中的it指代不清（指的应该是前面整件事）
平行结构【either。。。or。。。】either by。。。or by。。。排除AB， either accompanied by。。。or accompanied by...排除CD
AB: 代词it不管指代temperature还是gas在逻辑上都是说不通的
应该是increase cause by increase
考点；either。。。or 平行
it's actually an issue of parallelism, not idiomatic usage. remember that two-part parallel constructions (such as "either ... or ...") must be exactly parallel grammatically.
the main sentence is : the increase is accompanied either by....or by... 2B seemed right but the subject is not clear. the subjet in 2B should be gas, but it followed means increase.