利用形容词比较级加What's more来表示递进关系的段落承接：
What is more,Chinais getting ever hungrier.
What's worse, what's more obvious, what's funnier,
What's worse, the increase of people of this age group will cause more troubles to the educational system.
利用反义词来表示转折。
Not all observers, however, think that China's unstinting appetite for commodities is super.
However, imported food is not always making people feel better.
评判上文(或者讲上文的一个缺陷)表示转折：
This argument ignores the benefits that China's commodit
