雅思考试必备短语：B开头（一）

81.back and forth 来回地,反复地

82.back of在...后面

83. back up后备,支援

84.bare of几乎没有,缺乏

85.be able to do能够

86. be around差不多

87.be available to *.可用,可供

88.be bound to一定

89.be capable of doing能够

90.be concerned with 关心....，涉足...

91.be dying to渴望

92.be fed up with受够了be tired of

93.be in hospital住院

94.be in season 上市的/in peak season旺季

95. be in the mood to do sth.想做

96. be pressed for time时间不够

97.be tied up with忙于

98.be under the weather身体不好

99.beat around the bush 拐弯没角

100.beat the crowd避开人群