也谈省略

1.        The development of a new jumbo rocket that is expected to carry the United States into its next phase of space exploration will be able to deliver a heavier load of instruments into orbit than the space shuttle and at a lower cost.

Key: D) A newly developed jumbo rocket, which is expected to carry the United States into its next phase of space exploration, will be able to deliver a heavier load of instruments into orbit than the space shuttle can, and at a lower cost.（D）

81.   In 1973 mortgage payments represented twenty-one percent of an average thirty-year-old male’s income; and forty-four percent in 1984.

(A) income; and forty-four percent in 1984

(B) income; in 1984 the figure was forty-four percent

(C) income, and in 1984 forty-four percent

(D) income, forty-four percent in 1984 was the figure（B）

(E) income that rose to forty-four percent in 1984

og 的解释：Choices A and C, in failing to use separate clauses, are too elliptical and therefore unclear.

    第2题，C如果省略的话，那么省略了mortgage payments represented ，省略的主谓，如果省略主谓的话，极端的理解方法就是：到底谁和谁比？？不清楚的

   第一题省略了deliver a heavier load of instruments into orbit ，主谓没有省略，比较明晰，省略部分相同，不音响意思理解

In answer C "and in 1984 forty-four percent" 中and后部分与谁平行？前面的整个句子，所以最好AND后是个句子，而C仅仅罗列了时间状语和前句中宾语的相应部分，主谓全省，是不是太简单了，容易产生歧义。

You are rihgt, 例1中，and at a low cost是rocket will be at a low cost than spaceship的省略, 也省略了主谓，只剩表语。可能选项中没有补全的选项或若补全可能太wordy,这时候就要注意其有效性了。记住我们要兼顾correctness and effectiveness, and we only choose the BEST answer not only the PERFECT one.

In this case, you can not just analogy these two answers with out considering the different circumstances.个人愚见仅供参考。