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听力文本如下：
baby
back
bad
bag
bake
ball
banana
bank
bare
base
baseball
basket
basketball
bath
beach
bear
beat
beautiful
because
become
bed
before
below
bow
beside
best
between
bike
big
bird
birthday
bite
black
blackboard
blind
blood
blue
boat
body
boil
bone
book
bookstore
borrow
both
bottle
bottom
bowknot
bowl
box
boy
brain
branch
brave
bread
break
breakfast
breath
bridge
bring
brother
brown
brush
bucket
build
burn
bus
business
butter
butterfly
button
buy
by
