21. back

　　He slipped and fell on his back. 他仰天滑到。

　　22. balance

　　Don‘t get excited； keep your balance. 不要冲动，保持冷静。

　　23. base

　　A naval base is located at Wei Hai. 威海有个海军基地。

    24. behavior

　　Tom won a prize for good behavior at school. 汤姆在学校里得到品行优良奖。

　　25. belief

　　He has lost his belief in God. 他已不相信上帝。

　　26. birth

　　That baby weighed seven pounds at birth. 那婴儿生下来七磅重。

　　27. bit

　　He ate every bit of his dinner. 他把他的晚餐吃得光光。

　　She‘s feeling a bit tired. 她觉得有点疲倦。

　　He doesn‘t care a bit. 他一点也不在乎。

　　28. bite

　　His face was covered with insect bites. 他满脸都是蚊虫咬伤。

　　I haven‘t had a bite since morning. 我从早晨到现在一口东西都未吃过。

　　There‘s a bite in the air this morning. 今天早晨有点寒风刺骨。

　　29. blood

　　He gave his blood to help his sister. 他输血给他的妹妹以救她。

　　His blood is up. 他发脾气了。

　　His blood ran cold. 他吓得魂不附体。

　　30. blow

　　Let‘s go for a blow. 让我们到户外吹吹风。

　　31. body

　　His body was brought back to England for burial. 他的遗体被运回英国埋葬。

　　She‘s a nice old body. 她是一个很好的老人。

　　32. brass

　　get down to brass tacks 开门见山

　　33. bread

　　I‘m only dong it for the bread. 我纯粹是为了钱才做那件事。

　　34. breath

　　They are not be mentioned in the same breath. 他们不可同日而语。

　　There wasn‘t a breath of air/wind. 一丝微风都没有。

　　35. brother

　　He is my brother. 他是我的兄弟。

　　36. building

　　buidling materials 建筑材料

　　building site 建筑工地

　　37. burn

　　He died of the burns he received in the fire. 他死于火灾时所受到的灼伤。

　　38. burst

　　a burst of applause 一阵喝彩

　　39. business

　　He is in business of himself. 他自行经商。

　　That‘s no business of yours. 那事与你无关。

　　I‘m sick of the whole business. 我对这事情实在感到厌烦。

　　40. butter

　　butter will not melt in sb‘s mouth 一本正经的样子

　　peanut buttter 花生酱