21. – I prefer western food. It’s a kind of healthy food.

　 -- ___ But western food is said to be high in sugar and fat.

　 A. Is that right?　　　　　　　　 B. How do you know that?

　 C. Do you really think so?　　　　 D. Who told you that?

13. Michael’s new house is like a huge palace, 　　　　　　with his old one. 。(2009重庆)

。A. comparing　　 B. compares　 C. to compare　 D. compared 。

[解析]考查分词的用法。表达“与某物或某人相比”用compared with/to sb/sth. 。

单元测试

12._____ by the advances in technology, many farmers have set up wind farms on their land.

A. Being encouraged　　 B. Encouraging　 C. Encouraged　　　 D. Having encouraged

[解析]考查非谓语动词过去分词作原因状语的用法。分析句子可以看出，这是一个省略的原因状语从句，前后主语都是many farmers，由by the advances in technology，可知许多农民受到鼓舞，选C符合。

11. _________ the right kind of training , these teenage soccer players may one day grew the international stars.　 09江西)

A. Giving　　 B. Having given　　 C. To give　　　 D. Given　

[解析]D 考查非谓语动词。如果把句子补充完整就不难看出：If they are given the right kind of training , 可知主语they 即these teenager soccer players与give 之间是被动的关系，所以用过去分词。根据主、从句主语一致可省略从句主语的原则，连词if 也可省，所以得出given the right kind of training , these teenager soccer players……

10. ______ with the size of the whole earth，the biggest ocean doesn’t seem big at all．(2004年湖北)

　A．Compare　 B.When comparing 　C．Comparing　 D．When compared

[解析]本题考查过去分词作时间状语，可以将原句子改为：“When the biggest ocean is compared with size of the whole earth, it doesn’t seem big at all.”选择D选项。

9. When______different cultures，we often pay attention only to the differences without noticing the many similarities．(2005年浙江)

　A．compared　 B．being compared　 C．comparing　 D．having compared

[解析]本题考查现在分词作时间状语，可将原句子改为：“When we compare different cultures，we often pay attention only to the differences without noticing the many similarities．”选择C选项。

8．Generally speaking, ______according to the directions, the drug has no side effect. (2003’上海)

　A. when taking　 B. when taken　 C. when to take　 D. when to be taken

[简析]完整的说法应是when the drug is taken according to the directions,…由于主句的主语和从句的主语相同，因此可以省略从句的主语the drug和谓语的一部分is,答案为B。当然也可以省去when。

7．The research is so designed that once ____________ nothing can be done to change it．［NMET2002］　 A．begins　 B．having begun　 C．beginning　 D．begun　

[简析]答案为D。once begun在句中作条件状语，它是状语从句once it is begun的省略形式，句意为：这项调查研究事先计划的如此完好，以致于一旦开始，什么也无法改变它。 　　

6．____________ in thought，he almost ran into the car in front of him．［NMET96］　

A．Losing　 B．Having lost　 C．Lost D．To lose　

[简析]be lost in thought为固定搭配，意为“陷入沉思”，因此答案选C。过去分词短语 Lost in thought与句子主语he构成逻辑上的动宾关系，且在句中作原因状语。　

注意：过去分词作状语时，有时可以与一些连词连用，如：when, while, if, until, once等，这实际上是过去分词在省略句中的应用。 　

5．____________ more attention，the trees could have grown better．［MET90］　

A．Given B．To give　 C．Giving D．Having given　

[简析]句子主语the trees与give之间是被动关系，故答案选A，过去分词短语Given more attention作条件状语，放于句首。