21. characteristic [.kæriktə'ristik]n.特点，特性
What characteristics distinguish Americans from Canadians? 美国人和加拿大人的特徵有什麽不同?
Do you know the characteristics of the socialist market economy? 你知道社会主义的市场经济的特点是什么？
22. combine [kəm'bain]vt.&vi.
1)vt. 使结合
He is special, because he could combine work with pleasure. 他很特别，因为他能在工作中享受到乐趣。
This academic work has combined imagination and scholarship. 这个学术作品结合了想象和学术。
2)vi. 结合
When these two chemical elements were combined, a new reaction emerged. 当这两个化学元素结合起来，新的反应产生了。
Many factors combined to cause the economic recession. 许多因素结合起来产生了这场经济危机。
23. flavor ['fleivə]n.&vt.
1) n. 滋味；情趣
His dish has a strong spicy flavor. 这道菜辣味很重。
This is a film with an oriental flavor. 这是一部带有东方色彩的电影。
2) vt. 加味于
My mother flavored the fish with sugar and vinegar 妈妈用糖和醋给鱼调味。
Her coming flavored the whole party. 她的到来使晚会增添了情趣。
24. “consist of” Vs “consist in”
“consist of” [kən'sist ɔv]vt.包括；由... 组成
This class consists of 50 students. 这个班由50个人组成。
What does a Nobel Prize consist of? 诺贝尔奖都包括什么？
“consist in” [kən'sist in]vt. 在于；存在于
Love does not only consist in gazing at each other, but also in looking outward together in the same direction.
爱情不仅仅在于两人互相凝视对方，还包括看待事情的角度是一致的。
Her success consists in hard work and good habits. 她 的成功在于工作努力和习惯良好。
25. enjoyable [in'dʒɔiəbl]adj.令人愉快的
This afternoon is enjoyable. 这个下午很令人感到愉快。
Our hotel ensures that your stay here will be as enjoyable as possible. 我们的旅馆保证尽量让你们呆得愉快。
26. contrast with ['kɔntræst]n.&vt.
1) n.对比
In contrast with their system, ours seems very outdated. 我们的制度与他们的相比，显得过旧了。
2) vt.形成对比
The white wall contrasts with the black marble floor. 白墙黑地形成反差。
His gentleness contrasts with her rudeness. 他的温柔和她的粗鲁形成反差。
27. appealing [ə'pi:liŋ]adj.动人的; 引人入目的
Nowadays TV programs are so appealing that kids watch them all day long. 当今的电视节目越来越吸引人，以至于孩子们整天坐在电视机前。
She is trying to make herself as appealing as possible before going to the party. 去晚会前，她尽量把自己打扮得引人注目。
28. a variety of [və'raiəti]prep.各种各样的
I have a variety of books at home. 我家中有好多书。
She is healthy, because she eats a variety of food. 她健康，因为她吃各种食物。