26. That means a higher proportion of what is in the sea is being caught, so the real difference
between present and past is likely to be worse than the one recorded by changes in catch sizes.
   【分析】 这是因果复合句，前半句是原因，后半句结果，so 是断句标志。前半句中，
that means 后面是一个省略 that 的宾语从句，其中主语是 a higher proportion of what is in
the sea ，谓语是 is being caught 。后半句是一个比较级结构 the real difference … is likely
to be worse than the one…，注意 recorded by changes in catch sizes 是一个过去分词结构，
修饰 the one。
   【词汇】a higher proportion of 更 ...