89、 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.
　　(A) 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
　　(B) 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
　　(C) 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
　　(D) 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
　　(E) 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
　　原文意思： 当气体温度升高的时候， 温度伴随着压力的升高如果气体密闭在某个容器里或者伴随着体积 增大如果气体能膨胀的话。
　　题目分析： 原文有一个并列，就是温度伴随着 A 或者 B，但是 A either 后面跟 accompanied by 但是 or后面跟increase并不对应， 干掉。 B的either后面跟by而or后面直接是名词an increase， 不行，干掉。C 的 either 后面先跟动词再加 by 而 or 后面直接加 by，不合适，干掉。D 和 C 错误类似，干掉。E 的 either 后面跟 by 并且 or 后面也跟 by，比较对应，选 E。