B字母开头的单词或词组(第21页)：
- believe
- below
- belt
- bible
- beneath
- beneficial
- benefit
- beside
- besides
- best
- bet
- better
- beyond
- bicycle
- between
- big
- bike
- bilateral
- bill
- billion
- biography
- biology
- bipolar
- bipartisan
- bird
- birth
- birthday
- biscuit
- bite
- bitter
- black
- blackboard
- blame
- blank
- blanket
- bleed
- bless
- block
- blood
- blind
- bloom
- blow
- board
- boat